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

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

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

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

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

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（）

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

Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）

Flame failure in an automatically fired auxiliary boiler can from a/an （）