（） is not installed on the main switchboar.

Which of the following items don’t belong to dock repair works?（）

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

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

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

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 ISPS Code consists of a mandatory section-Part A, which shows（）

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

Diesel engine air start system check valves are opened by （）

To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）