按受力情况分,梁形有()、()和();板形有()和()。
参考答案:简支梁;连续梁;悬臂梁;单向板;双向板
离心式水泵中水封环的作用是什么?
— You won't follow this step, will you?
— ______. I don't think it is right.
A.No, I will
B.Yes, I won't
C.No, I won't
D.Yes, I will