如果实施垄断行为的经营者主动自首,提交参与垄断协议的证据材料,反垄断执法机构可以根据其自首行为,对其实施垄断行为的法律责任予以豁免。( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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