CRH3动车组动车转向架所用制动盘的直径为()mm,动车转向架所用制动盘的直径为() mm。

CRH3动车组动车转向架所用制动盘的直径为()mm,动车转向架所用制动盘的直径为() mm。

A.750

B.780

C.620

D.640

正确答案是AD