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________。

The fire pumps must be capable of delivering a total quantity of water at a defined head, not less than _____ of the total bilge pumping capacity.