柯萨奇病毒引起的疱疹性咽峡炎多发于()
A.冬春季
B.春秋季
C.夏秋季
D.春季
E.秋冬季
参考答案:C
Don't sit on the chair. There ___________ on it. [ ]
A. is some water
B. are some water
C. is any water
D. are any water
切牙切嵴的磨耗情况是
A.上颌切牙>下颌切牙B.下颌切牙>上颌切牙C.上颌切牙=下颌切牙D.侧切牙>中切牙E.以上都不是