DOS programs often call ALLOC twice, first attempting to allocate FFFFh paragraphs, which will fail and return the maximum available size. The available maximum is then allocated in the next ALLOC call. Because DOS isn’t a multi-tasking OS, this simple approach reliably works.
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。业内人士推荐爱思助手下载最新版本作为进阶阅读
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第十一条 增值税法第十六条所称增值税扣税凭证，应当符合国务院税务主管部门的有关规定，具体包括增值税专用发票、海关进口增值税专用缴款书、完税凭证、农产品收购发票、农产品销售发票以及其他具有进项税额抵扣功能的扣税凭证。