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问题 单项选择题

下列因素中对颅内压影响不大的是（）。

A.PaCO2

B.PaO2

C.血清钾水平

D.动脉血压

E.中心静脉压

答案

参考答案：C

解析：PaCO2升高和PaO2降低可引起脑血管扩张，脑血流增多，以及PaCO2降低时引起脑血管收缩导致脑血流减少从而影响颅内压。动脉血压通过改变脑血流的灌注以及中心静脉压在脑组织血流回流环节上影响颅内压。血清钾水平对决定颅内压的三大主要因素（脑组织体积、脑血流、脑脊液）均无显著影响。

填空题

A good translator is by definition bilingual. The opposite is not ______(1) true, however. A born and bred bilingual will still need two__________(2) to become a translator: first, the skills and experience necessary for__________(3); second, knowledge of the field in which he or she will__________(4). The skills and experience for translation include the ability to write ______(5) in the target language, the ability to read and understand the_________(6) language material thoroughly, and the ability to work with the latest__________(7) and communication hardware and software.Does a born and bred bilingual__________(8) a better translator than someone who learned language B later in__________(9) There is no definite answer, but the following issues are important.__________(10), a born and bred bilingual often suffers from not truly knowing __________(11) language well enough to translate, with some even suffering from what __________(12) known as a lingualism, a state in which a person lacks_________(13) full, fluent command of any language. Second, born and bred bilinguals__________(14) don’’t know the culture of the target language well enough to_________(15) top-quality translations, or cannot recognize what aspects of the source language__________(16) its culture need to be treated with particular care, as they_________(17) in a sense too close to the language. And last, they often_________(18) the analytical linguistic skills to work through a sticky text.On_________(19) other hand, the acquired bilingual may not have the same in-depth _________(20) of colloquialisms, slang, and dialect that the born bilingual has. Also, the acquired bilingual will not be able to translate as readily in both directions (from B to language A and A to language B). Finally, born bilinguals often have a greater appreciation of the subtleties and nuances of both their languages than someone who learns their B language later in life can ever hope to have.
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多项选择题

小区的覆盖范围取决于以下因素（）。

A、服务质量指标

B、发射机输出功率

C、天线方向性和增益

D、接收机灵敏度

E、传播环境

F、可用频段
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