岩基上的重力式码头基床厚度仅为50cm,宜采用()的块石作为抛石基床。
A.10~50kg
B.50~100kg
C.50~150kg
D.100~200kg
参考答案:A
--- Have you _____ him to give up the job?
--- Yes, I have. But he doesn’t listen to me.
A.persuaded
B.agreed
C.suggested
D.advised
画出图3—27示杆件AB的受力图(AB杆自重不计)。