柴油机吊缸时对活塞环进行检查和测量的项目有（）。Ⅰ.径向厚度（磨损）测量Ⅱ.搭口间隙测量Ⅲ.天地间隙测量Ⅳ.环背隙测量Ⅴ.环弹力检查Ⅵ.表面损伤检查

把仪表的最大绝对误差与仪表的测量范围之比的百分数称之为______。

当活塞采用浮动式活塞销时，相应地（）。

The amount of fluid delivered by a positive displacement pump can be regulated by _____.

If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably _____.

喷射泵的喉嘴距过大将导致________。