Fuels of different qualities may require advancing or retarding the injection timing, in addition to which if the injection timing is advanced when the engine is running at loads below the （）, then a saving in fuel can be achieved.

The plunger is machined to very fine tolerances, as is ...

单项选择题The plunger is machined to very fine tolerances, as is the matched（）in which it reciprocates.

It should be evident that the amount of fuel injected i...

单项选择题It should be evident that the amount of fuel injected into the cylinder is dependent on the position of the helix relative to the （）.

As the plunger moves upwards in the barrel, injection w...

单项选择题As the plunger moves upwards in the barrel, injection will commence once the plunger has （） the spill ports and the pressure builds up.