47. The cost of workmen’s compensation insurance is often based on _______________.
(A) basic salary
(B)plant location
(C)number of employees
(D)injury statistics

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統計： A(1), B(2), C(18), D(46), E(0) #1782093

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工業安全不僅僅發生。事故率低的公司計劃他...
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（d）傷害統計
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