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

The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）

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

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

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.

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

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

Which of the following items don’t belong to dock repair works?（）

（） is not installed on the main switchboar.

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