单项选择题
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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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 -
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
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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
