A:new
B:cold
C:nice
D:small
The police arrived at the________where the car accident happened and took pictures.
老大臣看布料过程心理变化分析正确的是( )
①SiO2+4HF=SiF4↑+2H2O ②SiO2+CaO 高温__ CaSiO3
③SiO2+2NaOH=Na2SiO3+H2O ④SiO2+2C 高温__ Si+2CO↑