Strong typhoons often hit this province        ，they form and come here between July and August every year．

A．partly

B．normally

C．regularly

D．frequently

镗工装夹工件时，一定要仔细将残留在夹具定位面上的（）清除干净，否则会降低调整精度，甚至使工件尺寸超差。

A.切削液

B.润滑油

C.切屑

D.污物

E.铁锈

F.水渍