单项选择题
A.density B.bore C.weight D.material
The main bearings are provided with thin-walled （）, lin...
单项选择题The main bearings are provided with thin-walled （）, lined with a copper-lead alloy.
A.steel guides B.steel shells C.steel bearing caps D.pig iron
The main bearing shells often have a thin （） of lead or...
单项选择题The main bearing shells often have a thin （） of lead or indium to provide a layer giving protection against corrosion.
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
