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.

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

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

Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）

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

The main purpose of port State control is not to（）

A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）

One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）

The condensers located in various stages of a flash evaporator are cooled by（）

To proceed to the assistance of a ship in distress is（）