性能代号为“ZSTX”代表()。 A.直立型喷头 B.下垂型喷头 C.直立边墙型喷头 发布时间:2019-02-03 22:14 │ 来源:www.tikuol.com 题型:单项选择题 问题: 性能代号为“ZSTX”代表()。A.直立型喷头B.下垂型喷头C.直立边墙型喷头D.隐蔽式喷头
题型:单项选择题 The meeting _______ by the time I got there yesterday. [ ]A. was onB. has been onC. had begun D. has begun 查看答案
题型:单项选择题 在25℃、101 kPa条件下,C(s)、H2(g)、CH3COOH(l)的燃烧热分别为393.5kJ/mol、285.8kJ/mol、870.3kJ/mol,则2C(s)+2H2(g)+O2(g)=CH3COOH(l)的反应热为 ( )A.-488.3 kJ/molB.+488.3 kJ/molC.-191 kJ/molD.+191 kJ/mol 查看答案