單項選擇題Pump up the starting air reservoirs to their maximum pressure and （）the air reservoirs and air system.
A.open
B.close
C.drain
D.vent
您可能感興趣的試卷
你可能感興趣的試題
1.單項選擇題James Watt （）the steam engine in 1796.
A.discovered
B.had discovered
C.invented
D.had invented
2.單項選擇題Energy loses （）friction occurs in every engine.
A.because
B.thanks to
C.dues to
D.owing to
最新試題
One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
題型：單項選擇題
（） is not installed on the main switchboar.
題型：單項選擇題
Which of the following items don’t belong to dock repair works?（）
題型：單項選擇題
The main purpose of port State control is not to（）
題型：單項選擇題
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
題型：單項選擇題