单项选择题
Fuel oil is thought to be one of the main factors （） the operation and maintenance of an engine.
A.have nothing to do with B.having nothing to do with C.have much to do with D.having much to do with
单项选择题 Fuel oil is pumped by means of （） from the bunker tanks.
单项选择题 Fuel is not supplied to the corresponding cylinders due to （）.
单项选择题 Fuel is not supplied to the corresponding cylinder due to a failure of （）.
