單項(xiàng)選擇題The sequence of fuel injection into cylinders is determined by ().

A.the steering
B.the driven gear
C.the turning gear
D.the timing gear


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1.單項(xiàng)選擇題The selection of an oil from the () depends to a great extent on the operating conditions, the design of the engine and the type of fuel to be burned.

A.commercially available
B.commercially
C.commercial available
D.commerce available

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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