(单选题)某企业只生产一种产品,单价6元,单位变动生产成本4元,单位销售和管理变动成本0.5元,销量500件,则其产品贡献边际为( )元 (本题2.0分)
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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