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（）

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

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

（） is not installed on the main switchboar.

The treatment of the fuel oils involves storage, heating, filtering and（）

The ISPS Code consists of a mandatory section-Part A, which shows（）

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

If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）

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