單項選擇題

An advantage of a helical gear pump over a simple gear pump is that the helical gear pump is capable of （）.

A.maintaining a steadier speed
B.delivering liquids over greater distances
C.operating for longer periods of time
D.producing a smoother discharge flow

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單項選擇題

The size of ball and roller bearings can be identified by the （）.

A.rolling member size
B.inner race cone width
C.manufacturers numerical code
D.outer ring width

單項選擇題

A centrifugal pump produces flow with a resulting discharge head by energy conversionIt is typical for the energy conversion to follow the order of （）.

A.mechanical energy to kinetic energy to potential energy
B.mechanical energy to potential energy to kinetic energy
C.potential energy to mechanical energy to kinetic energy
D.kinetic energy to mechanical energy to potential energy

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An advantage of a helical gear pump over a simple gear pump is that the helical gear pump is capable of （）.

你可能感興趣的試題

The size of ball and roller bearings can be identified by the （）.

A centrifugal pump produces flow with a resulting discharge head by energy conversionIt is typical for the energy conversion to follow the order of （）.

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