A:3CuS+8HNO3==3Cu(NO3)2+2NO↑+3S↓+4H2O
B:3Cl2+6KOH==5KCl+KClO3+3H2O
C:3H2O2+2KCrO2+2KOH==2K2CrO4+4H2O
D:3CCl4+K2Cr2O7==2CrO2Cl2+2COCl2+2KCl
— I don't know when ________ tomorrow.
— I will call you as soon as he ________.
一元二次方程x2+2x=0的根是( )