选择题：No sooner _______ than they began to work.(A)they

题目内容：
No sooner _______ than they began to work.
(A) they had arrived
(B) they would arrive
(C) had they arrived
(D) would they arrive
参考答案：

三相全控桥式整流电路带大电感负载时，控制角α的有效移相范围是（ ）。

三相全控桥式整流电路带大电感负载时，控制角α的有效移相范围是（ ）。 A.0°-90°B.30°-120°C.60°-150°D.60°-150°

分类：南阳师范学院-学前教育-大学英语（一）  题型：选择题
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