普惠制是在( )基础上进一步减税或全部免税的优惠待
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
纳税人兼营免税、减税项目的,未分别核算免税、减税项目的销售额的,由税务机关核定其减税、免税销售额,就核定金额减税或者免税。( )
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