阿摩線上測驗
38.Strainers should be provided with indicators to provide warning of the necessity for cleaning the strainers.
(A)pressure-drop
(B)temperature-drop
(C)reverse-flow
(D)overflow
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統計： A(376), B(90), C(76), D(96), E(0) #752007
統計： A(376), B(90), C(76), D(96), E(0) #752007
