A A．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818307_0_1.png"> B B．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818307_0_2.png"> C C．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818307_0_3.png"> D D．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818307_0_4.png">

A A．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818308_0_1.png"> B B．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818308_0_2.png"> C C．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818308_0_3.png"> D D．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818308_0_4.png">

A A．第一象限，靠近x轴 B B．第一象限，靠近y轴 C C．第二象限，靠近x轴 D D．第二象限，靠近y轴

A A．（a）更危险 B B．（b）更危险 C C．两者相同 D D．无法判断

A A．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818315_0_1.png"> B B．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818315_0_2.png"> C C．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818315_0_3.png"> D D．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818315_0_4.png">

A A．70MPa B B．10MPa C C．40MPa D D．50MPa

A A．xy平面和xz平面内的双向弯曲 B B．轴向拉伸及xy平面和xz平面内的双向弯曲 C C．轴向拉伸和xy平面内的平面弯曲 D D．轴向拉伸和xz平面内的平面弯曲

A A．拉伸和向上弯曲变形 B B．拉伸和向下弯曲变形 C C．弯曲变形 D D．拉伸变形

A A．x′z′平面内的平面弯曲 B B．扭转和x′z′平面内的平面弯曲 C C．x′y′平面和x′z′平面内的双向弯曲 D D．扭转和x′y′平面x′z′平面内的双向弯曲

A A．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818331_0.png"> B B．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818331_0_1.png"> C C．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818331_0_2.png"> D D．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23818331_0_3.png">