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

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

The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）

Using a file without a handle may result in （）

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

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

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

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

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

（） is not installed on the main switchboar.