I haven't settled the problem of        I'll go back home during the coming May Day.

A which 　              B. what 　          C. whether 　           D. where

齿轮泵漏泄一般主要发生在（）。

A.齿轮端面间隙

B.齿顶间隙

C.啮合齿之间

D.轴封