IEEE 802.3标准MAC子层和物理层之间的接口,不包括 ( )A.发送和接收帧 发布时间:2017-06-12 15:12 │ 来源:www.tikuol.com 题型:单项选择题 问题: IEEE 802.3标准MAC子层和物理层之间的接口,不包括 ( )A.发送和接收帧B.载波监听C.起动传输D.冲突控制
题型:单项选择题 农科所向农民推荐渝江I号和渝江Ⅱ号两种新型良种稻谷。在田间管理和土质相同的条件下,Ⅱ号稻谷单位面积的产量比I号稻谷低20%,但Ⅱ号稻谷的米质好,价格比I号高。已知I号稻谷国家的收购价是l6元/千克。(1)当Ⅱ号稻谷的国家收购价是多少时,在田间管理、土质和面积相同的两块田里分别种植I号、Ⅱ号稻谷的收益相同?(2)去年小王在土质、面积相同的两块田里分别种植I号、Ⅱ号稻谷,且进行了相同的田间管理收获后,小王把稻谷全部都卖给国家。卖给国家时,Ⅱ号稻谷的国家收购价定为2.2元/千克,I号稻谷国家的收购价未变,这样小王卖Ⅱ号稻谷比卖I号稻谷多收入l040元,那么小王去年卖给国家的稻谷共有多少千克? 查看答案
题型:单项选择题 根据短文内容完成表格。 One day Mrs. Thomas goes shopping (购物). She goes into a big supermarket. She buys many things. She buys two hamburgers. They are 2 dollars each. She buys some French fries, 1 dollar. She buys some fruit, too. Bananas are 2 dollars and strawberries are 4 dollars. She also buys a T-shirt, socks, shorts, a dress (连衣裙), a hat and a bag. The T-shirt is 4 dollars. The socks are 1 dollars, and the shorts are 10 dollars. The dress is 7 dollars. The hat is 3 dollars and the bag is 6 dollars. Things Food Fruit T-shirt, shorts and dressSocks and hatBag How much 1.______ dollars2.______ dollars 3._______ dollars4.________ dollars 5.______ dollars 查看答案