腹股沟斜疝与直疝主要鉴别点是()。
A.发病年龄不同
B.有无咳嗽冲击感
C.压迫内环后疝是否再突出
D.嵌顿机会的多少
E.疝块外形不同
参考答案:C
Neither of them knows the difference ______ the two and we can’t tell one ______ the other, either.
A.between; between
B.among; from
C.among; between
D.between; from
牙的发育过程包括
A.发生
B.成形
C.钙化
D.出龈
E.萌出