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

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

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.

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

A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）

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

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

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

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

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