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

The ISPS Code consists of a mandatory section-Part A, which shows（）

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.

Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）

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（）

Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）

Engine parameters shall be corresponded to NOx Technical Files. This is required by （）

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

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