-What a heavy rain!
-So it is. I prefer ___________ rather than ___________ on such a rainy day.
A:to go out; stay at home
B:to stay at home; go out
C:going out; stay at home
D:staying at home; go out
如图所示,若△ABE≌△ACF,且AB=5,AE=2,则EC的长为( )
在盛有一定质量的碳酸钙固体的锥形瓶中,滴加稀盐酸至没有气泡产生为止,刚好用去69.5mL(密度为1.05g/cm3)质量分数为10%的盐酸.求反应后所得溶液中溶质的质量分数.(最后结果精确到0.1%)
工业在国民经济中占据着非常重要的地位.以下说法哪个是对的( )