挤压弯管时,管坯除受弯曲力的矩作用外,同时还受什么和与轴向力方向相反的什么力作用?
参考答案:
还受轴向和与轴向力方向相反的摩擦力作用。
Normally you could stay with us, but our house ______ at the moment.
A.is decorated
B.was decorated
C.is being decorated
D.was being decorated
岩层产状的什么是要素有哪些?