问题
选择题
It was the third time that he of the changes of the meeting. [ ]
A. had informed
B. had been informed
C. has informed
D. has been informed
答案
答案：B
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It was the third time that he of the changes of the meeting. [ ]
A. had informed
B. had been informed
C. has informed
D. has been informed
答案：B
a时，lmol H2完全燃烧生成液态水，放出2
85．8kJ的热量；1 mol CH4完全燃烧生成液态水和CO2气体，放出890．3kJ的热量。下列热化学方程式书写正确的是 （ ）
）+2 O2（g）=CO2（g）+2H2O（1）；△H=-890．3kJ／mol