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
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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 -
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The sealing rings are in four parts and pressed together around the piston rods by means of （）.
A.nuts
B.bolts
C.coil springs
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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
