I don't know if he () tomorrow. If he ()tomorrow, please ring me up.

A．comes; comes

B．will come; will come

C．will come; comes

D．comes; will come

关于锅炉运行中锅筒内的水位，下列说法错的是（）。

A.刚补水时水位反而降低

B.加强燃烧后，未补水水位也会上升

C.骤然开大停汽阀，水位迅速降低

D.减弱燃烧后，水位即会降低