简述紫外线的杀菌机制。

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问题:

简述紫外线的杀菌机制。

考点:微生物学微生物学题库
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发展科学技术事业和科技教育,通过培训,使人民群众不断接受新知识和新(),不断提高依靠科技致富的能力。

A.理论

B.方法

C.技能

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十字头柴油机活塞上通常装有()。

A.压缩环与承磨环

B.压缩环与刮油环

C.刮油环与承磨环

D.压缩环、刮油环与承磨环

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完成句子

1. It was very dangerous because if I was caught I ________________(我可能要坐牢). (put)

2. The old man became very worried, standing at the gate, unable to find a man to ________________(他可以求助的). (turn)

3. Only then ________________(他才愿意)take my advice that the meeting be put off. (willing)

4. The old man ________________(非常喜欢)travelling that he spent almost all his savings for it.

(fond)

5. What's the name of the place ________________(你度假的) last year? (spend)

6. Neil Armstrong and Edwin Aldrin were the first ________________(登上月球的). But they were

not the last. (land)

7. On the mountain ________________(有一座庙)at an altitude of more than 3,000 metres above

the sea level. (lie)

8. The miners ________________(被困的)in the mine for days were finally rescued.(trap)

9. It was because of his burning up the government building ________________(他被判刑)2 years.

(sentence)

10. It is reported that many a new house ______________(被建造)at present in the disaster area.

(construct)

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确认胃管是否在胃内的方法?

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位于项区和胸背区上部,由副神经支配的肌是()

A.背阔肌

B.斜方肌

C.听诊三角

D.枕下三角

E.夹肌和半棘肌

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