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

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

出自：海船船员证

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