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

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

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

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?（）

Using a file without a handle may result in （）

（） is not installed on the main switchboar.

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

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

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