单项选择题

某电池在 298 K，标准压力下可逆放电时，放出 100 J 的热量，则该电池反应的焓变值DrHm为（）。
A、100 J
B、>100 J
C、<100 J
D、-100 J

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单项选择题

Why was Lucy worried?
A、Because she didn’t know how to cope with people at the party.
B、Because she didn’t know how to cope with the coming exam.
C、Because she didn’t know how to cope with her weekends.
D、Because she didn’t know how to cope with the coming holiday.

现对环境空气中的SO2进行采样，采样时间为对20h，采样流量为0.2L/min，采样时现场大气压为100.3KPa，温度为20℃，求参比采样体积

答案：