A:增加产品数量,开拓产品市场
B:改进产品性能,降低产品价值
C:提高产品科技含量,增加产品附加值
D:改变产品使用价值,调整产品营销模式
Jim records his physical training every time so that he can________it and think about how he should improve it the next day.
既不是质数,又不是合数的数是( )