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

The shipboard oil pollution emergency plan will be invalid after （）

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

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

Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）

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

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

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

Using a file without a handle may result in （）

（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.