题目内容
在可能出现异常的地方，根据if判断是否抛出异常，满足异常抛出条件的时候，才抛出异常。
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The BHP Billiton protocol covers gifts, hospitality and entertainmentthat may be offered to BHP Billiton employees by business associates.
BHP Billiton employees must make a note about any gift they receive.
BHP Billiton employees can accept expensive gifts.
BHP Billiton employees must clearly explain the company policy about
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