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北京大学1999硕士研究生入学考试试题

考试科目：外科学

考生需知：

1．A 型题每题仅一个正确答案。

2．X 型题中每题可能不止一个答案，考生须将答案组合用大写英文字母表示并填入答题中相应的空格内。

A=1+2+3

B=1+3

C=2+4

D=4

E=1+2+3+4

3．本考卷满分为100分，凡报考外科学专业硕士均需回答里部试题。

一、外科基础部分（20分）

K 型题

1．With regard to the acid-buffering system of the

extraccllular fluid,which of the following statements is/are

true?

(1) The bicarbonare-carbonic acid system is the primary

extracellular buffering system.

(2) The ratio of the base bicarbonate to carbonic acid

determines the extracelluler fluid pH.

(3) The functions of the extracellular buffering system are

expressed in the Heerjersoon-Hasselbalce equation.

(4) A bicarbonate-carbonic acid ratio of 20:1 is associated

with a normal pH(7.4)