6.3×101-6.3.
6.3×101-6.3
=6.3×(101-1)
=6.3×100
=630
— _____?
— It's red and white. [ ]
A. What's this
B. How are you
C. What color is it
D. What's your name
“绿色化学”追求减少化工生产对环境造成的污染,下列物质中可以称为“绿色氧化剂”的是( )
A.浓硫酸
B.氯气
C.双氧水
D.漂白粉