阿摩線上測驗
5. What kind of action should be done before operating any centrifugal pump?
(A) See pump glands
(B) Check lubrication
(C) Filling liquid for case
(D) Open the connection between pump and motor
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統計： A(63), B(153), C(730), D(219), E(0) #2197225
統計： A(63), B(153), C(730), D(219), E(0) #2197225
