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

單項選擇題

A donkey boiler is （）.

A.one to supply steam to the main propulsion turbine
B.an auxiliary boiler
C.A and B
D.neither A nor B

你可能感興趣的試題

單項選擇題

Safety valves on a boiler vent to the （）.

A.fuel tank
B.bilge
C.atmosphere
D.auxiliary exhaust line

單項選擇題

The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.

A.ensure feed water flow into the boiler
B.keep the steam drum pressure high
C.prevent water hammer in the feed line
D.help the feed water flash to steam

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

A donkey boiler is （）.

你可能感興趣的試題

Safety valves on a boiler vent to the （）.

The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.

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