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?（）
举一反三
- The external circumference of a pair of main bearing shells is slightly （） that of the bore of the housing which receives them Whats the meaning of “that” in the sentence above？
- A main bearing consists of two shells which are secured by means of studs and （）.
- The metal utensils made from iron, copper and aluminum are forbidden to decoct drugs.
- Metal utensils such as iron, copper, or aluminum are appropriate to prepare decoctions.
- The main bearing shells often have a thin （） of lead or indium to provide a layer giving protection against corrosion.