—Could we complete the task according to the schedule?

—I doubt that．The problem remains _____ we can get financial aid from the government．

A．that

B．when

C．why

D．where

更换粘合制袋机冷却水管线上的压力表时，应关闭是进、回水管线上的（）。

A.开关

B.阀门

C.电源

D.气源