一个因数扩大100倍,另一个因数缩小10倍,它们的积扩大______倍.
100÷10=10,
答:一个因数扩大100倍,另一个因数缩小10倍,它们的积10倍.
故答案为:10.
用电子式表示下列物质的形成过程:(4分)
NaF:
②H2S:
—How often do you take exercise?
—_____ [ ]
A. Sometimes
B. Three hours
C. At three o'clock
D. In two hours