《滇南本草》（成书于1436年）和《本草纲目》（成书于1578年）是明朝两部医药著作。《滇南本草》的一个版本中有“玉米须”的记载，有学者据此推断玉米在哥伦布1492年到达美洲之前就为中国人所知。而该书的另一版本中出现了“《本草纲目》曰”的字样。由此可以得出的合理认识是（）。 ["玉米在哥伦布到达美洲之前就已经传入中国西南","《本草纲目》是中国最早记载玉米药用价值的著作","《滇南本草》书中参考了《本草纲目》的部分内容","《滇南本草》不应作为研究玉米传入中国的第一手材料"]
科学管理的意义
Which statement about the Link Control Protocol （LCP） is true？（） ["LCP is used for basic PPP link setup and operation.","LCP is used for PPP CHAP authentication.","LCP is used for PPP over ATM （PPPoA） setup.","LCP is used for PPP over Ethernet （PPPoE） setup.","LCP is used for PPP over Frame Relay （PPPoFR） setu"]
微生物修复
Users have been complaining that their Frame Relay connection to the corporate site is very slow. The network administrator suspects that the link is overloaded. Based on the partial output of the Router# show frame relay pvc command shown in the graphic, which output value indicates to the local router that traffic sent to the corporate site is experiencing congestion?（） [" DLCI = 100"," last time PVC status changed 00:25:40"," in BECN packets 192"," in FECN packets 147"," in DE packets 0"]
漕运
