对于平面应力状态,由于只有x、y方向的应力作用,所以单元体在z轴方向上没有应变发生。
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正应力极值所在截面的切应力一定为零。
A. 对
B. 错
He kept complaining about everything, which really ______ us.
A. annoyed
B. annoys
C. annoying
D. annoy
People with high EQs often have positive _______ towards life.
A. gratitude
B. attitudes
C. appointment
D. altitude
All of us change our _______to fit different situations.
A. bestow
B. behave
C. behavior
D. beneath