三相电机的额定功率4KW，额定转速1440转/分，其能输出的额定转矩是（）。
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下列关于牌号Y112M-4说法正确的是（）。
A. “Y”表示Y系列鼠笼式异步电动机（“YR”表示绕线式异步机）；
B. “112”表示电机的中心高为112mm；
C. “M”表示机座（L表示长机座，S表示短机座）；
D. “4”表示磁极对数为4的电机。
说一说三相异步电动机型号：Y112M-4中各符号的意义 。
Task 1 Complete the following sentences with noun clauses.1. Go and see _________（去看看是谁）.
A. who is he
B. who he is
C. who are they
D. who it is
2.（ 她不明白的） was why fewer and fewer students were interested in her lessons.
A. What she couldn't understand
B. That she couldn't understand
C. Because she couldn't understand
D. Why she couldn't understand
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