Agar comes from multiple sources, as many red seaweeds are “agarophytes” (that is, seaweeds containing agar in their cell walls). Species of Gelidium are the most important source of bacteriological (lab-grade) agar. Other main agarophytes, largely used for culinary agar, include red seaweeds from the genera Gracilaria, Pterocladia, Ahnfeltia, and others. Species from the genera Eucheuma, Gigartina, and Chondrus have been used as agarophytes in research during agar shortages.9
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，这一点在快连下载安装中也有详细论述
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第四十八条 纳税人适用退（免）税、免征增值税的出口业务，应当按照规定期限申报；逾期未申报的，按照视同向境内销售的规定缴纳增值税。