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问题 单项选择题

关于肺脓肿的抗菌治疗，下列哪项是正确的()

A．一般不少于8周，以免复发

B．大剂量青霉素一般对厌氧菌也敏感

C．临床症状及X线检查病变完全消失后停药

D．厌氧菌对青霉素不敏感时用甲硝唑和(或)克林霉素

E．包括以上各项

答案

参考答案：E

单项选择题

女，23岁，间歇性吞咽困难3年。X线钡餐检查显示：食管下端呈鸟嘴样狭窄。何种疾病可能性最大( )

A．食管下段癌
B．贲门失弛缓症
C．食管炎
D．食管瘢痕性狭窄
E．食管平滑肌瘤
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单项选择题

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

Microwave communication uses (1) -frequency radio waves that travel in straightline sthrough the air. Because the waves cannot (2) with the curvature of the earth, they can be (3) only over short distance. Thus, microwave is a good (4) for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of" dishes" or (5) . These can be installed on towers, highbuildings, and mountain tops.

4（）

A．material

B．equipment

C．medium

D．channel
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