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

The condensers located in various stages of a flash evaporator are cooled by（）

During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.

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

The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

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

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

Using a file without a handle may result in （）

Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）

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