4.03×0.15的积有______位小数.
4.03是两位小数,0.15是两位小数;
3×5=15,2+2=4;
所以,4.03×0.15的积是四位小数.
故答案为:四.
______ some housework can make your mother_______.
A.Doing; happy
B. Making ; happy
C.Doing; happily
D.Making ; happily
何谓混合性呼吸困难?