单项选择题
A.main bearing shells B.main bearing C.steel D.bearing metal
The main bearing metal is a lining （）.A.inside the bear...
单项选择题The main bearing metal is a lining （）.
A.inside the bearing B.outside the bearing C.covering the crankshaft D.none of the above
The machine has stopped rotating because the bearing （）...
单项选择题The machine has stopped rotating because the bearing （） the shaft.
A.seized B.clogged C.melted D.inserted
The lubricating system for the cylinder walls is differ...
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
