-They have __________ homework this weekend.  

-That's too bad.[ ]

A. too much

B. too many

C. much too

D. many too

M730平面磨床为保证加工精度，其运动平稳，确保工作台往复运动时惯性小无冲击，采用（）实现工作台往复运动及砂轮箱横向进给。

A.气动传动

B.液压传动

C.机械传动

D.电气传动