單項(xiàng)選擇題

The globe valve has a bulbous body, housing a valve seat and screw down plug or disc arranged at right angles to the axis of the pipeAccording to the above sentence, which of the following statements is not true?（）

A.The profile of the valve is like a globe
B.The valve seat is set into the bulbous body
C.The plug or disc of the valve is made vertical to the axis of the pipe
D.The valve seat is located at right side of the plug or disc

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單項(xiàng)選擇題

Cocks and valves control or interrupt flow, and have internal passages arranged so that they can be restricted or closed: in cocks, by rotating the plug, and in valves, by lowering, raising or rotating a disc in relation to a seating surfaceAccording to the above sentence, which of the following statements is not true?（）

A.Flows of fluids can be restricted by both cocks and valves
B.There are seats in the internal passages of valves
C.A disc of valve only moves up and down
D.We can infer that there is a bore in cock ping

單項(xiàng)選擇題

It should be apparent that little or nothing is gained by opening a drain at the same time as or after admitting steamThe above sentence probably means （）.

A.There is apparent condensate in piping
B.The steam is not discovered after admitting steam
C.The condensate should be fully loaded in the piping as admitting steam
D.The condensate should be fully drained from the piping while admitting steam

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The globe valve has a bulbous body, housing a valve seat and screw down plug or disc arranged at right angles to the axis of the pipeAccording to the above sentence, which of the following statements is not true?（）

你可能感興趣的試題

It should be apparent that little or nothing is gained by opening a drain at the same time as or after admitting steamThe above sentence probably means （）.

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