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举一反三
【单选题】符合血友病正确描述的是（）
A.
血友病甲又称为血浆凝血活酶成分缺乏症
B.
血友病丙又称为血浆凝血活酶前质缺乏症
C.
血友病甲和乙为X-连锁显性遗传
D.
血友病丙为常染色体完全性隐性遗传
E.
凝血因子Ⅶ、Ⅸ、Ⅺ缺乏可导致血液凝固障碍
【单选题】关于血友病儿童的口腔治疗原则，叙述错误的是（）
A.
行下颌阻滞或上牙槽阻滞，凝血因子浓度应达到50％水平
B.
可以在局部麻醉下行活髓切断术或牙髓摘除术
C.
乳牙正常脱落通常不会导致出血
D.
可行洁治术
E.
可行正畸治疗
【单选题】Defective Genes and Human Health Each of us carries about half a dozen defective(有缺点的) genes. We remain blissfully(快乐地) unaware of this fact unless we, or one of our close relatives, are amongst the m...
A.
Genetically engineered proteins are better than blood products in treating hemophilia.
B.
Only those who suffer from a genetic disease carry about half a dozen defective genes.
C.
The Y chromosome males have are from their fathers.
D.
Whether a defensive gene produces ill effects has something to do with the environment in which the gene operates.