单项选择题
U.S. employers spend a considerable amount of time and resources on both formal and informal training including safety training. A national survey found establishments with 50 or more employees paid $7.7 billion to in-house training staff and $5.5 billion to outside trainers in 1994, $139 and $98 per employee respectively [2].
A、Quotes from publications
B、Example
C、Expert testimony
D、Experience
A.S.
B.7
C.5
D.
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