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【单选题】
热敏电阻式湿敏元件能够直接检测( )A.
温度
B.
温湿度
C.
相对湿度
D.
绝对湿度
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【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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