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【单选题】
在建设工程实施过程中，对于那些发生概率较小且发生后损失较小的风险因素不一定者采取主动措施，这是因为( )。A.
风险可以忽略不计
B.
主动控制是不可能的
C.
主动控制是不经济的
D.
被控制的效果比主动控制好
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