单项选择题
The machine has stopped rotating because the bearing （） the shaft.
A.seized
B.clogged
C.melted
D.inserted
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相关考题
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单项选择题
The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in （） while that for latter one is （）.
A.sufficient quantity； measured
B.measured quantity；sufficient
C.excessive quantity；sufficient
D.the less quantity the better；the more the better -
单项选择题
The lubricating pipes and dusts should be blown out with （）.
A.atmosphere
B.the fresh water
C.compressed air
D.chemical compounds -
单项选择题
The lubricating oil is pumped from the drain tank, very often with （） in the suction line.
A.a filter
B.a strainer
C.a magnetic filter
D.a fine strainer
