右上第三磨牙高位阻生，双根，远中根折断约3mm，根尖无病变，应当
A．不予拔除B．延期拔除C．根钳拔除D．牙挺拔除E．翻瓣法去骨拔除
参考答案：A
Some of the students are afraid of the teachers strict with students. [ ]
A. that is
B. who is
C. which are
D. who are
尼可刹米的作用机理
A．选择性兴奋延脑呼吸中枢
B．刺激颈动脉体反射性兴奋呼吸中枢
C．刺激主动脉体放射性兴奋呼吸中枢
D．阻断腺苷受体反射性兴奋呼吸中枢
E．拮抗苯二氮卓受体反射性兴奋呼吸中枢
