29 For fire safety, the contractor needs to be to be sure of the safe use of power and fire.
(A) misled
(B) monitored
(C) simulated
(D) simplified
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統計: A(25), B(184), C(84), D(46), E(0) #2355267
統計: A(25), B(184), C(84), D(46), E(0) #2355267