指针式万用表主要由指示部分、()、转换装置三部分组成。
A.表头部分
B.测量电路
C.切换旋钮
D.测试部分
参考答案:B
—Which animal do you like?
—I like zebras and ________.[ ]
A. deer
B. tiger
C. kangaroos
I was supposed to _______ all my shopping by now, but I still have a great many to buy.
A.to have finished
B.to finish
C.to be finishing
D.to have been finished