华华过生日,买了一个周长为48厘米的圆形蛋糕,在它的四周每隔4厘米插上一根小蜡烛.共插了______根蜡烛.
48÷4=12(根).
答:共需12根.
故答案为:12.
- How often do you have PE classes?
- ________, Monday, Wednesday and Friday.
[ ]
A. Every three days
B. Every other day
C. Every two days
D. Every day
鼻道窦口复合体包括的结构有()
A.上颌窦窦口
B.钩突
C.半月裂
D.筛泡
E.中鼻道