剥脱性龈病损不包括（）
A.牙龈红斑
B.牙龈红斑狼疮
C.牙龈类天疱疮
D.牙龈天疱疮
E.牙龈扁平苔藓
参考答案：A
A shipmate chokes suddenly，cannot speak，and starts to turn blue. You should（）.
A.perform the Heimlich maneuver
B.make the victim lie down with the feet elevated to get blood to the brain
C.immediately administer CPR
D.do nothing until the victim becomes unconscious
临床上引起甲减最常见的病因
A．先天性甲状腺发育不良
B．桥本氏甲状腺炎
C．亚急性甲状腺炎
D．甲状腺酶系异常
E．垂体瘤
