单项选择题
The bearing shells depend on the accuracy of （） to held them in a truly circular shape.
A.the gap B.the clearance C.the bore D.the housing
单项选择题 The bearing shell generally has （） for location and oil grooves round the center of its axial length.
单项选择题 The auxiliary engine and a cgenerator can be connected with （）.
单项选择题 The amount of lubricating oil in the drain tank should be checked by （）.
