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

Using a file without a handle may result in （）

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

（） is not installed on the main switchboar.

If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）

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

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

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

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