—Could you tell me when your father ______ back? 　　

—I'm not sure now. But when he ______ next week, I'll tell you. [ ]

A. return, comes

B. will come, returns

C. comes, will return

D. will return, comes

弯矩调幅值必须加以限制，主要是考虑到（）

A.力的平衡

B.施工方便

C.正常使用要求

D.经济

E.施工方便