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

Using a file without a handle may result in （）

“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）

The cetane rating of diesel fuel is an indication of the （）

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（）

Flame failure in an automatically fired auxiliary boiler can from a/an （）

Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）

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

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

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