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当前学科：危险化学品安全作业
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《安全生产法》规定，安全生产监督检查人员执行监督检查任务时，必须出示有效的监督执法证件.”有效的监督执法证件”是指（）。
A
安全生产监督管理部门的介绍信
B
安全生产监督管理部门制发的工作证件
C
有关部门制发的一种专门的证件
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