If you can’t read the new words, you may __ in the dictionary.

A．look it up

B．look up it

C．look them up

D．look up them

当烟机出口温度＞650℃，且轮盘冷却蒸汽＜（）MPa（G）时，烟机突然跳闸停机。

A、0.25

B、0.31

C、0.33

D、0.35