题干
________ he had won the first prize, he felt very happy.
A：Know
B：Know
C：Knowing
D：Being know
答案(点此获取答案解析）
C
2NH3 (g) △H =" -92.0" k
J/mol，将此温度下的1 mol N2和3 mol H2放在一密闭容器中，在催化剂存在时进行反应，达到平衡时，反应放出的热量为（忽略能量损失）（ ）