The system has been designed to give students quick and easy to the digital resources of the library.
A. accessB. passage C. way D. approach
第1题:
A. wrote
B. designed
C. built
D. drew
第2题:
A.Encryption
B.Biometric
C.Password Authentication
D.Digital
第3题:
1digital为合法标识符
第4题:
interfaceDeclareStuff{publicstaticfinalintEASY=3;voiddoStuff(intt);}publicclassTestDeclareimplementsDeclareStuff{publicstaticvoidmain(String[]args){intx=5;newTestDeclare().doStuff(++x);}voiddoStuff(ints){s+=EASY+++s;System.out.println(”s+s);}}Whatistheresult?()
A.s14
B.s16
C.s10
D.Compilationfails.
E.Anexceptionisthrownatruntime.
第5题:
第6题:
将students中的列变量重新命名为: (1)id_number, name, gender, score, has_graduate (2)选出Bob的性别gender,并存入变量bob_gender (3)选出列has_graduate,并存入向量status (4)创建数据框part_df,其中包含前三个学生的所有信息 (5)创建数据框rest_df,包含其余学生的所有信息