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

Engine parameters shall be corresponded to NOx Technical Files. This is required by （）

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

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

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

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（）

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

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

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（）