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问题 单项选择题

瘀血引起的疼痛以（）为主

A.刺痛

B.胀痛

C.隐痛

D.重痛

E.钝痛

答案

参考答案：A

解答题
双曲线
x2
a2
-
y2
b2
=1（a＞1，b＞0）的焦点距为2c，直线l过点（a，0）和（0，b），且点（1，0）到直线l的距离与点（-1，0）到直线l的距离之和s≥
4
5
c．求双曲线的离心率e的取值范围．
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单项选择题

For many years, the principle goal of computer (73) was to write short pieces of code that would execute quickly. The (74) needed to be small, because memory was expensive, and it needed to be fast ,because processing power was also expensive.

A. users B. programmers C. computer D. program
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