单项选择题
A.flange B.flash C.plate D.sheet
The main bearing shells are made of steel with a lining...
单项选择题The main bearing shells are made of steel with a lining of bearing metal which may be white metal, copper-lead or aluminum-tin alloy What is the meaning of “which” in the sentence above?（）
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
