If separating effect is not good, which measure should be taken （）

Flame failure in an automatically fired auxiliary boiler can from a/an （）

Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）

During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.

The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.