如果+20%表示增加20%，那么-6%表示______．
根据正数和负数的定义可知，-6%表示减少6%．
故答案为：减少6%．
3007060000读作三十亿零七十六万．______．
_____ of the students who took part in the military training is 450.[ ]
A. A number
B. A lot
C. Lots
D. The number
