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
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相关考题
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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 -
单项选择题
It is very important that each cylinder should be （） scavenged before the charged air is compressed.
A.well
B.good
C.excellent
D.respectively
