问题
单项选择题
Digitalis is a drug which is prepared from the seeds and leafs of a plant with the same name and is used as a cardiac stimulant.
答案
参考答案：leafs→leaves
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Digitalis is a drug which is prepared from the seeds and leafs of a plant with the same name and is used as a cardiac stimulant.
参考答案：leafs→leaves
O2（g）=H2O（l）；△H=-285.8kJ/mol
O2（g）=CO2（g）；△H=-282.6kJ/mol
O2（g）=8CO2（g）+9H2O（l）；△H=-5472kJ/mol