（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.

Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）

Under MARPOL Code the ship to which it applies has to carry （）

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

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

By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）

Cold weather starting of a diesel engine may be made easier by（）

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.

The shipboard oil pollution emergency plan will be invalid after （）

The treatment of the fuel oils involves storage, heating, filtering and（）