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患者右腮腺区恶性肿瘤，行局部扩大切除及胸大肌皮瓣修复，其术区未于口腔相通。

考虑缝合后，其引流物的放置应为（）

A.放置引流物，局部加压包扎即可

B.应放置24～48小时引流，必要时延至72小时以上

C.暂不放置引流物，以后根据创口愈合情况考虑是否放置引流物

D.引流物放置于皮下即可，不必置于较深层部位

E.引流物放置可从任意方向放入，不必考虑重力和体位因素

答案

参考答案：B

单项选择题

Most earthquakes occur within the upper 15 miles of the earth’s surface. But earthquakes can and do occur at all depths to about 460 miles. Their number decreases as the depth increases. At about 460 miles one earthquake occurs only every few years. Near the surface earthquakes may run as high as 100 in a month, but the yearly average does not vary much. In comparison with the total number of earthquakes each year, the number of disastrous earthquakes is very small.
The extent of the disaster in an earthquake depends on many factors. If you carefully build a toy house with an erect set, it will still stand no matter how much you shake the table. But if you build a toy house with a pack of cards, a slight shake of the table will make it fall. An earthquake in Agadir, Morocco, was not p enough to be recorded on distant instruments, but it completely destroyed the city. Many per earthquakes have done comparatively little damage. If a building is well constructed and built on solid ground, it will resist an earthquake. Most deaths in earthquakes have been due to faulty building construction or poor building sites. A third and very serious factor is panic. When people rush out into narrow streets, more deaths will result.
The United Nations has played an important part in reducing the damage done by earthquakes. It has sent a team of experts to all countries known to be affected by earthquakes. Working with local geologists and engineers, the experts have studied the nature of the ground and the type of most practical building code for the local area. If followed, these suggestions will make disastrous earthquakes almost a thing of the past.
There is one type of earthquake disaster that little can be done about. This is the disaster caused by seismic sea waves, or tsunamis. (These are often called tidal waves, but the name is incorrect. They have nothing to do with tides.) In certain areas, earthquakes take place beneath the sea. These submarine earthquakes sometimes give rise to seismic sea waves. The waves are not noticeable out at sea because of their long wave length. But when they roll into harbors, they pile up into walls of water 6 to 60 feet high. The Japanese call them "tsunamis", meaning "harbor waves", because they reach a sizable height only in harbors. Tsunamis travel fairly slowly, at speeds up to 500 miles an hour. An adequate warning system is in use to warn all shores likely to be reached by the waves. But this only enables people to leave the threatened shores for higher ground. There is no way to stop the oncoming wave.

The significance of the slow speed of tsunamis is that people may

A．notice them out at sea．

B．find ways to stop them．

C．be warned early enough．

D．develop warning systems．
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多项选择题

下列有关深Ⅱ°烧伤的描述，正确的有（）

A．一般不伤及真皮 * * 层

B．上皮的再生有赖于残存的皮肤附件

C．如无继发感染，一般经3～4周愈合

D．愈合后一般不留瘢痕

E．若继发感染，创面常需手术植皮才能愈合
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