在髂嵴上方浅出处比较集中，当腰部急性扭伤时，该神经易受损伤（） A.股后皮神经 B.

第二节．短文改错 （共10分）

At Christmas Eve, Jim went with his                     91.__________

father to choose a Christmas tree. They choose          92. ___________.

A big one.It was almost as taller as the room!          93.___________.

They put them in the corner of the sitting              94.___________.

room. Kate was covered it with a lot of                 95.___________.

Christmas light. The sitting room looked                96.____________.

really beautifully at the moment. There was             97.____________.

a fire burning in the fire place, but the Chistmas      98. ____________.

tree lights were shinning brightly. Jim and his         99._____________

parents singing and dancing happily.                   100._____________

活菌计数中不正确的做法是（）

A.严格无菌操作，防止污染

B.认真检查试验器材有无破损，以防丢失样本和污染环境

C.注意菌液的均匀分散

D.稀释或取液时要准确，尽量减少吸管使用中产生的误差

E.为节省无菌器械的消耗，用一支吸管从高浓度到低浓度逐个取样

牙骨质由牙胚的哪部分形成（）

A.成釉器

B.牙蕾

C.牙囊

D.牙板剩余

E.牙 * *

某男，患高血压20余年，在查体时最不可能出现的是

A．主动脉第二音减弱
B．视网膜动静脉交叉受压
C．尿常规RBC(++)，Pro(+)
D．ECG：Rv5+Sv1＞4.0mV
E．PDE：室间隔厚度20mm，左室后壁10mm

焊接结束或中断时，应将弧坑填满，否则易出现（）。