乳牙易患龋的因素不正确的是()
A.口腔自洁和清洁作用差
B.儿童饮食多为软质饮食
C.乳牙的釉质、牙本质薄,抗酸力强
D.乳牙牙颈部明显缩窄
E.邻牙之间为面的接触
参考答案:C
用括号内所给单词的适当形式填空
1. A chef____(call) George Crum invented potato chips.
2. The trees ____(not water) last week.
3. It ____(report) that Bill Gates will give us a talk this weekend.
4. The river by the village has____(rise) by several meters.
5. Modern music was first____(develop) in Italy.
M8002有什么功能()。
A.置位功能
B.复位功能
C.常数
D.初始化功能