单项选择题
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
The scavenging box is built of a number of sections pro...
单项选择题The scavenging box is built of a number of sections provided with vertical flanges enabling them （） together to form two blocks.
A.being bolted B.bolted C.bolting D.to be bolted
