第1题:
I ()have been here, but I()not find the time.
A. could; could
B. might; could
C. should; could
D. should; would
第2题:
A.economy/political
B.social/political
C.economy/social
D.political/cultural
第3题:
______ it rain tomorrow moring, the loading ______.
A.Should / will be postponed
B.If / shall be postponed
C.Should / would be postponed
D.If / has to be postponed
第4题:
By the time he graduated from high school, he________(learn) five thousand words.
第5题:
________ the vessel have no safety radiotelegraphy certificate at the time of her delivery,she ________ be held to be unseaworthy.
A.If/may
B.Will/shall
C.Should/would
D.Would/should
第6题:
下列关于apply方法说法正确的是()。
A.apply方法是对DataFrame每一个元素应用某个函数的
B.apply方法能够实现所有aggregate方法的功能
C.apply方法和map方法都能够进行聚合操作
D.apply方法只能够对行列进行操作