纵隔气肿X线摄影体位除常规体位外，还必须加照（） A.前弓位 B.侧位 C.侧卧水平

小题1:The scientist finally made his dream come true in his ______________.（ninety）

小题2:It’s ___________（fair）for people to blame air pollution on the developing countries.

小题3:Who do you think will be the first Chinese ______________（walk）on the moon?

小题4:The ______________（salesman）addresses and telephone numbers are recorded in yellow pages.

小题5:Of all, Chen Xin did the experiment _____________（success）. She is the perfect helper that we need.

小题6:—Does the white kite belong to ______________（she）—No, that’s ours. Her kite was made in blue.

小题7:I don’t think Kate saw me. She ______________（quarrel）with her classmates then.

小题8:A better transport system can make our city ______________（crowd）than before.

小题9:______________（fix）the mess in his computer, he searched the internet for further information.

小题10:—Why didn’t Tom go to the cinema yesterday?   —He ______________（see）the film twice.

小题11:Our headmaster insisted that all students should ______________（dress）neatly and properly.

小题12:Soon they found they had no choice but _____________（sit）there waiting.

小题13:The Centre is open ______________（day）8.30 a.m. -4.30p.m..

小题14:As result of the ______________（lose）of too much blood, the old man passed away at last.

小题15:Follow me, guys! Close your eyes, open your arm and ______________ （breath）deeply.

原核生物基因转录终止子在终止点前均有( )。

A．回文结构

B．多聚A序列

C．TATA结构

D．多聚T结构

如图所示，abcd为交流发电机的矩形线圈，其面积为S，匝数为n，线圈电阻为r，外电阻为R．线圈在磁感应强度为B的匀强磁场中绕垂直于磁场的转轴OO’匀速转动，角速度为ω．若图中的电压表、电流表均为理想交流电表，求：

（1）此交流发电机产生感应电动势的最大值E_M；

（2）若从图示位置开始计时，写出感应电流随时间变化的函数表达式；

（3）交流电压表和交流电流表的示数．

患者男，30岁，工人。因“胸闷不适1周，无明显发热”来诊。患者3个月前自4.5米高脚手架跌落，当时检查发现第7～9肋骨骨折，脾破裂。行脾切除术并胸带固定后逐渐恢复。胸部X线检查：纵隔影增宽。

若患者T38.5℃，间断咯血1周无法控制，下一步治疗方案是（）

A.肺叶切除术

B.严格控制感染，同时放置胸管引流

C.严格控制感染，降主动脉腔内修复术

D.严格控制感染，开胸动脉瘤切除，降主动脉人工血管置换术

E.支气管镜引导下气管支架植入术

移频自动闭塞系统，分为非电气化区段和（）区段两种类型。