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单选题
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
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单选题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 valvesB
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Open the guardian valve and standby to maneuverD
Open the master control valves on the fixed CO2 system
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