單項選擇題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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3.單項選擇題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