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

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

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

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

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.

（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.

Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）

The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）

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

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