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【单选题】
交流电的文字符号为?A.
AC
B.
VC
C.
DC
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参考解析：
知识点：
皮皮学刷刷变学霸
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【单选题】I went skiing with my friends. We all enjoyed ourselves.
A.
had a good time
B.
liked ourselves
C.
happy
【简答题】This morning, I went camping along a path in Green Natural Park with my friends. We were happy because it was a sunny day. We were expecting an enjoyable two-day holiday. On the way, we kept singing a...
【单选题】在平面应力状态下，对于任意两斜截面上的正应力σα=σβ成立的充分必要条件是：
A.
σx=σy,τxy≠0
B.
σx=σy,τxy=0
C.
σx≠σy,τxy≠0
D.
σx=σy=τxy
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