單項(xiàng)選擇題

A pump is defined as device that（）

A.produces pressure
B.imparts energy to a fluid to move it from level ‘A’ to level ‘B’
C.creates a vacuum to move a liquid in all installation
D.is to develop a pressure differential

你可能感興趣的試題

單項(xiàng)選擇題

A distorted furnace in a fire-tube auxiliary boiler may be the result of （）

A.firing for extended periods in the low fire mode
B.overheating, due to waterside deposits
C.varying the water level above the crown sheet
D.carrying excessive alkalinity in the boiler water

單項(xiàng)選擇題

Fins are installed on the fireside of water-tubes used in waste boiler to（）

A.decrease the velocity of gases flowing past the tubes
B.increase the rate of heat transfer
C.reduce accumulations carbon deposits
D.direct the flow of gases

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 pump is defined as device that（）

你可能感興趣的試題

A distorted furnace in a fire-tube auxiliary boiler may be the result of （）

Fins are installed on the fireside of water-tubes used in waste boiler 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