发现成败火情，为避免引起恐慌，应迅速采取有效自救措施，若无法控制再报警。

结节是指牙釉质的（）。

A.过分钙化所形成的小突起

B.长线状隆起

C.近似锥体形的显著隆起

D.半月形突起

E.三面相交形成的小突起

下列有关维生素B2的叙述，错误的是

A．维生素B2又称核黄素

B．FMN和FAD是它的活性形式

C．FMN和FAD是黄酶的辅酶

D．FMN在生物氧化中传递电子

E．维生素B2缺乏时常引起口角炎、唇炎

You can't imagine             when the pupils received these nice presents on Children's Day. [ ]

A. how they were excited

B. how excited they were

C. how excited were they

D. they were how excited

降低血清胆红素的方法有______________、______________。

古代帝王陵体结构的变化大致经历了三个阶段：战国、秦汉时期为______，唐朝为以山为陵，明清为______。