单项选择题
Fuel pump index is （）.
A.the viscosity index B.the fuel oil contents C.the starting speed D.the reading at the rack
单项选择题 Fuel oil is thought to be one of the main factors （） the operation and maintenance of an engine.
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 （）.
