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[问答题,简答题] 农民能自行购买退耕还林的种苗吗?

肛管与直肠的交界线是:() ["齿线","肛白线","肛门皮肤线","直肠柱线","以上均不对"] 直肠全长大约是:() ["3cm","6cm","9cm","12cm","15cm"] 下面关于肛门直肠解剖名词的说法,错误的是:() ["直肠柱又称肛柱","直肠瓣又称肛门瓣","肛隐窝又称肛窦","希耳顿线相当于括约肌间沟","肛乳头又称肛乳突"] 近熟林 中龄林 农民能自行购买退耕还林的种苗吗?
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