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.

_____ shows 1.2 meter and the specific gravity of the oil is 0.96According to the measuring scale, that makes 150 tons.

When anaerobic bacteria convert the sewage to an inert sludge, .