决定超渗产流的因素有（）。A.降雨量， B.降雨强度， C.土湿。

试述脑室外引流术的目的。

女，35岁， * * 分泌物多，伴腰酸。妇科检查：宫颈肥大，呈颗粒状突起，波及面积不到整个宫颈面的2/3

对该病人下列哪项是最佳治疗手段？（）

A.宫颈锥切术

B.局部药物治疗

C.全身抗炎

D.物理治疗

E.手术切除子宫

Light travels at a speed which is about a million times faster than the speed of sound. In one second, light travels about 300,000km, but sound travels only 344m. You can get some idea of this difference by watching the start of a race. If you stand some distance away from the starter, you can see smoke come from his gun before the sound reaches your ears. This great speed of light produces some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays（光线）left the moon 1.3 seconds before they reached you. The nearest star is so far away that the light which you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km per minute. In some cases the light from one of tonight’s stars started on its journey to you before you were born.

Thus, if we want to be honest, we cannot say “ The stars are shining tonight.” We have to say, “ The stars look pretty. They were shining four years ago but their light has only just reached Earth.”

小题1: Light speed is ________ than sound speed.

A．millions times faster

B．a million times slower

C．about millions of times faster

D．about a million times faster小题2:If you stand 200 meters away from a man who is firing a gun to start a race, you will find out that _____.

A．you can hear the gun before you see the smoke.

B．sound does not travel as fast as light.

C．the sound of the gun will reach you before the man fires his gun.

D．sound travels about a million times faster than light.小题3:What does “ it” refer to?

A．moon light

B．light rays

C．the nearest star

D．the moon小题4:The scientific way of saying “ The stars are shining tonight” should be________.

A．the stars have been shining all the time.

B．the stars seen tonight will be shining four years later.

C．the stars were shining long ago but are seen tonight.

D．the starlight seen today could be seen four years ago.

立体视觉可以用同视机来检查。

下列溃疡性结肠炎的晚期表现中，错误的是（）

A.“钮扣样”溃疡

B.结肠袋消失

C.结肠缩短

D.骶前间隙变窄

E.均匀分布的雪花样钡斑