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【简答题】
设法延长药物在胃中的停留时间,使其在胃中缓慢释放,然后到达吸收部位的制剂有________ 、________ 。对于吸收差的药物,除了延长其在胃肠道的滞留时间,还可以用________,它能改变膜的性能而促进吸收。
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