路用车按()核收运费运送货物时,在重车状态下按运用车办理。A.50% B.60% C 发布时间:2019-12-13 03:57 │ 来源:www.tikuol.com 题型:单项选择题 问题: 路用车按()核收运费运送货物时,在重车状态下按运用车办理。A.50%B.60%C.70%D.80%
题型:单项选择题 —Mother’s birthday is coming, I’ll make a card for her. Please keep it secret.—_____________.I won’t tell anybody about this.A.No, I don’t.B.Yes, I doC.OK, I willD.OK, I won’t 查看答案
题型:单项选择题 已知氢气和碳燃烧的热化学方程式为: ①2H2(g)+O2(g)==2H2O(l);△H1=-akJ·mol-1②H2(g)+1/2O2(g)==H2O(g);△H2=-bkJ·mol-1③C(s)+1/2O2(g)==CO(g);△H3=-ckJ·mol-1④C(s)+O2(g)==CO2(g);△H4=-dkJ·mol-1 且abcd均大于零,下列说法正确的是 [ ]A.氢气的燃烧热为bkJ·mol-1 B.碳的燃烧热为ckJ·mol-1C.一氧化碳的燃烧热为(c-d)kJ·mol-1D.1/2a>b 查看答案