A:Cl2+2NaBr=Br2+2NaCl
B:Na2CO3+2HCl=2NaCl+H2O+CO2↑
C:BaCl2+H2SO4=BaSO4↓+2HCl
D:NaOH+HNO3=NaNO3+H2O
如今很多校园暴力事件,施暴的多数人不知道为什么要去打人,只是出于朋友的义气“帮忙”,惹下了无端的麻烦。所以,友谊的贼船该翻就得勇敢去翻。这告诫我们( )
—What did you do yesterday?—My brother took two friends of ________ to play chess with us. But I don't know _______ of them.
小东在百米赛跑中第1秒内通过的路程是3米,第2秒内通过的路程是5米,第3秒内通过的路程是7米,则他在这3秒内( )