39 It is necessary to wear the ________ mask when entering an empty oil tank to perform works.
(A) protective
(B) visible
(C) audible
(D) heavy th

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統計: A(50), B(7), C(2), D(2), E(0) #3255935

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#6138679
進入空油箱進行工作時,必須佩戴 ___...
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