（） is not installed on the main switchboar.

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.

The main purpose of port State control is not to（）

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

To proceed to the assistance of a ship in distress is（）

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

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（）

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.