19. Which valve is used to relieve excess pressure in steam piping?
(A) Globe valve
(B) Throttle valve
(C) Relief valve
(D) Quick closing valve

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統計： A(22), B(14), C(60), D(8), E(0) #1333665

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哪一種閥是使用在解除管內蒸氣壓力過載 ?...
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