当基础受竖向力N和弯矩M共同作用时,其最大压应力应满足()。
A.p≤[fa]
B.pmax≤[fa]
C.p≤γa[fa]
D.pmax≤γa[fa]
参考答案:D
Is this the reason ________ she explained in the report for her success in the job?[ ]
A.what
B.that
C.how
D.why
如图所示,把具有一定质量的塑料挂钩吸盘用手压在竖直的墙上,挤出里面的空气。放手后,吸盘就在竖直的墙面上静止不动。请你画出塑料挂钩吸盘放手后的受力示意图。