99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

單項(xiàng)選擇題

By far the greatest use is for diesel engine starting using air pressure of 25 bar or more provided by （）.

A.rotary compressors
B.reciprocating compressors
C.centrifugal compressors
D.screw compressors

你可能感興趣的試題

單項(xiàng)選擇題

Compressed air is used on board ship for all the following purposes except （）.

A.starting diesel engines
B.pneumatic control systems
C.pneumatic tools
D.supercharging air

單項(xiàng)選擇題

Low pressure air is usually taken through （） or pressure regulators to a low pressure reservoir supplying a ring main through driers.

A.globe valves
B.butterfly valves
C.gate valves
D.reducing valves

<dl id="pogic"></dl>