儿童牙龄发育不正确的是
A.4~10个月乳牙开始萌出B.12个月不出牙可视为异常C.乳牙为24颗D.最晚2.5岁出齐E.2岁以内乳牙数目约为月龄减4~6
参考答案:C
--- Shenzhen is a beautiful city.
--- Yes. You can see a lot of flowers and trees on ________ of the streets .
A.both sides
B.all sides
C.both side
D.all side
]扫描仪可以将图像扫描到计算机中,是一种常见的图像输入设备。