单项选择题
A.commercially available B.commercially C.commercial available D.commerce available
The selection of an oil depends （） on the operating con...
单项选择题The selection of an oil depends （） on the operating conditions, the design of the engine and the type of fuel to be burned.
A.to a great extent B.on a great extent C.on mainly D.on only
The selection of a lubricating oil depends to a great e...
单项选择题The selection of a lubricating oil depends to a great extent on the operating conditions,（）.
A.the type of coolant B.the design of the engine C.the type of fuel to be burned D.B and C
The sealing rings are in four parts and pressed togethe...
单项选择题The sealing rings are in four parts and pressed together around the piston rods by means of （）.
A.nuts B.bolts C.coil springs D.stuffing boxes
