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

Engine parameters shall be corresponded to NOx Technical Files. This is required 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 （）

If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）

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

The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）

（） is not installed on the main switchboar.

“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）

As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）