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【多选题】
关于原始凭证,下列说法中正确的是( )。
A.
自制原始凭证必须有经办单位领导人或者其指定的人员签名或者盖章
B.
支付款项的原始凭证必须有收款单位和收款人的收款证明
C.
职工借款凭据在收回借款后应退还给职工本人
D.
购买实物的原始凭证必须有验收证明
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