题目内容

It is obligatory that every child ______ their parents.

A. looks after
B. looked after
C. must look after
D. should look after

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By the end of this year, all the tasks________.

A. have completed
B. will completed
C. will be completed
D. will have been completed

Mr. Bush preferred_______ heavier work to do.

A. to be given
B. to have given
C. to be giving
D. having given

下列代码编译和运行的结果是：public static void main(String[] args) {String[] elements = { "for", "tea", "too" };String first = (elements.length > 0) ? elements[0] : null;System.out.println(first);}

A. 编译出错
B. 输出：tea
C. 输出：for
D. 输出：null

三相异步电机的能耗制动方法和实施过程是怎样的？