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

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

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

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

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.

（） is not installed on the main switchboar.

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（）

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

Under MARPOL Code the ship to which it applies has to carry （）

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