试述小儿血管瘤的临床表现。
在磨牙髓腔,自髓底至根分叉处的管道是() ["管间吻合","根管侧支","根尖分歧","根尖分叉","副根管"]
下列有关酶的概念哪一项是正确的() ["所有的蛋白质都有酶活性","其底物都是有机化合物","其催化活性都需要特异的辅助因子","对底物都有绝对专一性","其化学本质是蛋白质或RNA"]
"决渎之官"指的是() ["A.胆","B.胃","C.小肠","D.三焦","E.膀胱"]
小儿脱水,维持阶段的输液时间为()。 ["A.4~8h","B.8~12h","C.12~16h","D.16~24h","E.24h"]
当较大纵向收缩力受到阻碍时,可产生()与()的现象.