A:标准状况下,将1g铝片投入20mL 18.4mol/L的硫酸中
B:常温下,向100mL 3mol/L的硝酸中加入6.4g铜
C:在适当温度和催化剂作用下,用2molSO2和1molO2合成SO3
D:将含有少量H2O(g)的H2通入盛有足量Na2O2容器中并不断用电火花点燃
— I'm sorry I can't go with you. I have a lot of homework to do.
如图,在△ABC中,AD⊥BC于点D,DB=DC,若BC=6,AD=5,则图中阴影部分的面积为( )