If the action of the engine indicates that some of the cylinders are not firing, the ones affected may be determined by watching （）.

The injection may be delayed, （）the pumps are in good o...

单项选择题The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air.

If cylinder liner wear is up to maximum limits the poss...

单项选择题If cylinder liner wear is up to maximum limits the possibility of scavenge fires will not be materially reduced until the liners are （）.

Fuel injection equipment must be kept in good condition...

单项选择题Fuel injection equipment must be kept in good condition, timed correctly, and the （）in each cylinder must also be carefully balanced so that individual cylinders are not overloaded.