客户端通过______协议发送电子邮件。 A.FTP B.SMTP C.HTTP 发布时间:2019-04-05 13:52 │ 来源:www.tikuol.com 题型:单项选择题 问题: 客户端通过______协议发送电子邮件。A.FTP B.SMTP C.HTTP D.POP3
题型:单项选择题 The boy doesn′t speak _____ his sister, but his writing is _____ good.A. as well as, so B. more worse than, such C. as well as, such D. worse than, so 查看答案
题型:单项选择题 On June 11th, 2013, Shenzhou-10 carrying three astronauts into space from the space center in Jiuquan. All the Chinese people are proud of its successful launch.A. sent up B. are sent up C. was sent up 查看答案
题型:单项选择题 有机物A的分子式为C57H104O6,在硫酸存在条件下发生水解反应:A+3H2O3B+C,其中生成物C中含有3个羟基,相对分子质量为92,B能与等物质的量的NaOH恰好完全中和。则A、C的结构简式为A__________,C__________。 查看答案
题型:单项选择题 共价键的断裂有均裂和异裂两种方式,即均裂:,异裂:。下列化学反应中发生共价键均裂的是 [ ]A. 2K+2H2O=2KOH+H2↑ B. 2Na+2C2H5OH→2C2H5ONa+H2↑C. Na2CO3+ H2ONaHCO3 + NaOHD. CH3COOH +C2H5OHH2O+CH3COOC2H5 查看答案