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【单选题】
平车的车种代码是( )A.
P
B.
N
C.
X
D.
C
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【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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