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

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

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

For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）

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

By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）

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 （）

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

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