函数f(x)=ax2+bx+c(a≠0),f(x)的导函数是f′(x),集合A={x|f(x)>0},B={x|f′(x)>0},若B⊆A,则( )
⑴____hair hear
⑵____there where
⑶____chair here
⑷____pear bear
①CO2+H2O═H2CO3
②NH4HCO3 △_ H2O+CO2↑+NH3↑
③2H2S+O2 点燃_ 2S+2H2O
④2NaOH+CuCl2═Cu(OH)2↓+2NaCl.