单项选择题
Keep compartment （） as the gas given off can be dangerous.
A.well ventilated
B.well clean
C.in good order
D.more room
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相关考题
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单项选择题
It is well known that good lubrication will （） the bearings from becoming overheated.
A.present
B.prevent
C.avoid
D.provide -
单项选择题
It is very necessary that each cylinder （） before the charged air is compressed.
A.is scavenged
B.has been scavenged
C.be scavenged
D.was scavenged -
单项选择题
It is very necessary that each cylinder （） before the charged air is compressed.
A.is scavenged
B.is atomized with fuel oil
C.be scavenged
D.be atomized with fuel oil
