定向爆破常伴有反应:2Al+Fe2O3 高温 . Al2O3+2Fe,此反应中发生还原反应的物质是( )
A.Al
B.Fe
C.Fe2O3
D.Al2O3
答案:C
比例尺1:200表示图上1厘米代表实际______厘米.
Our bad living habits will destroy the earth. Only by changing we live
save the earth.
A.what; can we
B.how; can we
C.where; we can
D.how, we can