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更多“3、按允许通过的信号的频率范围的不同,滤波器又分为 (low⁃pass filter), (high⁃pass filter)和带通滤波器(band pass filter) 。”相关问题
  • 第1题:

    For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because

    A.changing filter elements would not interrupt engine operation

    B.filtering occurs twice in each pass of oil through the system

    C.clogging will not occur

    D.dropping pressure is half of that through a single filter unit


    正确答案:A

  • 第2题:

    A dirty diesel engine oil filter element can best be detected by ______.

    A.visual inspection of the elements

    B.the pressure drop across the filter

    C.high lube oil sump temperature

    D.decrease in oil viscosity from the filter


    正确答案:B

  • 第3题:

    下列说法正确的是()

    • A、Filter接口可以帮助我们在WEB应用中实施过滤技术
    • B、Filter接口拥有Init(FilterConfig filterConfig)方法
    • C、FilterChain是代码的过滤链,通过这个接口把过滤的任务在不同的Filter之间转移
    • D、FilterConfig接口代表了Filter的配置
    • E、FilterChain接口代表了Filter的配置

    正确答案:A,B,C,D

  • 第4题:

    Which the three are true about servlet filters?()

    • A、 A filter must implement the destroy method
    • B、 A filter must implement the doFilter method
    • C、 A servlet may have multiple filters associated with it
    • D、 A servlet that is to have a filter applied to it must implement the javax.servlet.FilterChain  interface
    • E、 A filter that is part of a filter chain passes control to the next filter in the chain by invoking the filterChain forward method
    • F、 For each  element in the web application deployment descriptor, multiple instances of a filter may be created by the web container

    正确答案:A,B,C

  • 第5题:

    滤波器按其通过信号频率范围的不同,可分为()滤波器、()滤波器、()滤波器和()滤波器。


    正确答案:低通;高通;带通;带阻

  • 第6题:

    在J2EE中,在web.xml中定义过滤器时可以指定初始化参数,以下定义正确的是()。

    • A、<filter-mapping><filter-name>someFilter</filter-name><init-param>
    • B、<filter-mapping><filter-name>someFilter</filter-name>
    • C、<filter><filter-name>someFilter</filter-name>
    • D、<filter><fiter-name>someFilter</filter-name><init-param>

    正确答案:C

  • 第7题:

    What are BCP 38 (Best Common Practices 38)/RFC 2827 Ingress Packet Filtering Principles?()

    • A、Filter Smurf ICMP packets.
    • B、Filter as close to the core as possible
    • C、Filter as close to the edge as possible
    • D、Filter as precisely as possible
    • E、Filter both source and destination where possible

    正确答案:C,D,E

  • 第8题:

    单选题
    Placing a filter on the () of an oily water separator will "polish" the discharge but overloading must be avoided.
    A

    suction side

    B

    discharge side

    C

    by-pass pipe

    D

    sampling pipe


    正确答案: C
    解析: 暂无解析

  • 第9题:

    单选题
    For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because ().
    A

    changing filter elements would not interrupt engine operation

    B

    filtering occurs twice in each pass of oil through the system

    C

    clogging will not occur

    D

    dropping pressure is half of that through a single filter unit


    正确答案: A
    解析: 暂无解析

  • 第10题:

    多选题
    You want to create a filter for your web application and your filter will implement javax.servlet.Filter. Which two statements are true?()
    A

    Your filter class must implement an init method and a destroy method.

    B

    Your filter class must also implement javax.servlet.FilterChain.

    C

    When your filter chains to the next filter, it should pass the same arguments it received in its doFiltermethod.

    D

    The method that your filter invokes on the object it received that implements javax.servlet.FilterChaincan invoke either another filter or a servlet.

    E

    Your filter class must implement a doFilter method that takes, among other things, anHTTPServletRequest object and an HTTPServletResponse object.


    正确答案: C,B
    解析: 暂无解析

  • 第11题:

    多选题
    Which the three are true about servlet filters?()
    A

    A filter must implement the destroy method

    B

    A filter must implement the doFilter method

    C

    A servlet may have multiple filters associated with it

    D

    A servlet that is to have a filter applied to it must implement the javax.servlet.FilterChain  interface

    E

    A filter that is part of a filter chain passes control to the next filter in the chain by invoking the filterChain forward method

    F

    For each  element in the web application deployment descriptor, multiple instances of a filter may be created by the web container


    正确答案: D,F
    解析: 暂无解析

  • 第12题:

    多选题
    按照所选通的信号频率范围的不同,滤波器分为()。
    A

    高通滤波器

    B

    带通滤波器

    C

    低通滤波器

    D

    带阻滤波器


    正确答案: B,C
    解析: 暂无解析

  • 第13题:

    以下语句正确的是()

    A、CommonDialogl.Filter=AllFiles|*.*|Pictures(*.Bmp)|*.Bmp

    B、CommonDialogl.Filter="AllFiles"|"*.*"|"Pictures(*.Bmp)"|"*.Bmp"

    C、CommonDialogl.Filter="AllFiles|*.*|Pictures(*.Bmp)|*.Bmp"

    D、CommonDialogl.Filter={AllFiles|*.*|Pictures(*.Bmp)|*.Bmp|


    正确答案:C

  • 第14题:

    A packet is evaluated against three user-defined terms within a firewall filter and no match is found. What correctly describes the action the firewall filter will take for this packet?()

    • A、The filter will permit the packet and take no additional action
    • B、The filter will reject the packet and send an ICMP message back to the sender
    • C、The filter will discard the packet and take no additional action
    • D、The filter will permit the packet and write a log entry to the firewall log

    正确答案:C

  • 第15题:

    可以将高频部分从声音中滤除的是()

    • A、“High Pass”特效
    • B、Parametric EQ特效
    • C、”Low Pass”特效
    • D、“Cutoff Pass”特效

    正确答案:C

  • 第16题:

    关于Servlet Filter,下列说法正确的有() 

    • A、Filter其实就是一个Servlet
    • B、Filter可以产生response
    • C、Filter可以在Servlet被调用之前截获request
    • D、Filter可以哟活过来处理统一认证,过滤不雅字句等

    正确答案:C,D

  • 第17题:

    按照所选通的信号频率范围的不同,滤波器分为()。

    • A、高通滤波器
    • B、带通滤波器
    • C、低通滤波器
    • D、带阻滤波器

    正确答案:A,B,C,D

  • 第18题:

    filter()和find()的区别是filter()用于向下查找,find()用于同级查找。()


    正确答案:正确

  • 第19题:

    When creating a SQL tuning set,which of the following steps allows the DBA to reduce the size of the SQL set by selecting specific operators and values?()

    • A、 Filter versions
    • B、 Filter loads
    • C、 Filter tasks
    • D、 Filter options

    正确答案:D

  • 第20题:

    单选题
    Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a ().
    A

    high temperature and a high viscosity

    B

    high temperature and a low viscosity

    C

    low temperature and a high viscosity

    D

    low temperature and a low viscosity


    正确答案: A
    解析: 暂无解析

  • 第21题:

    单选题
    以下有关自定义servlet、filter错误的是()
    A

    是在uap项目的weB.xml中定义servlet、filter

    B

    在模块中定义servlet、filter时,首先是模块的启动顺序决定了模块中所有servlet、filter的顺序

    C

    如果同一个模块中servlet、filter定义在不同的文件中,文件被加载解析的顺序也会影响模块servlet、filter的顺序

    D

    模块中同一个配置文件中定义的servlet、filter按被定义的前后顺序处理


    正确答案: D
    解析: 暂无解析

  • 第22题:

    单选题
    When creating a SQL tuning set,which of the following steps allows the DBA to reduce the size of the SQL set by selecting specific operators and values?()
    A

     Filter versions

    B

     Filter loads

    C

     Filter tasks

    D

     Filter options


    正确答案: D
    解析: 暂无解析

  • 第23题:

    单选题
    Copper is often used as an electrical conductor because it ().
    A

    has high resistance at low temperatures

    B

    has a highly polished surface

    C

    is able to pass current with little opposition

    D

    holds insulation together well


    正确答案: D
    解析: 暂无解析

  • 第24题:

    单选题
    可以将高频部分从声音中滤除的是()
    A

    “High Pass”特效

    B

    Parametric EQ特效

    C

    ”Low Pass”特效

    D

    “Cutoff Pass”特效


    正确答案: D
    解析: 暂无解析