别嘌呤醇治疗痛风病，是因为它能抑制黄嘌呤氧化酶活性，阻止尿酸的形成。
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已知0＜P﹙B﹚＜1，且P[(A1＋A2)｜B]＝P(A1｜B)＋P(A2 ｜B)，则下列选项成立的是()．
This laser-doppler radar will be especially valuable in space because________.
A. the speeds of space vehicles will vary greatly
B. accurate measurements are essential in space
C. inaccuracies in measurement could cause accidents in space
D. all of the above
All of the following are mentioned in the passage EXCEPT______.
A. the American Revolution was a revolt
B. Paul's friend signaled from a church
C. the British troops were sent to control the colonists
D. Paul's friend was serving in the British army
个体的主要满足来自于与口唇相关的性欲活动，这是指()。
A. 口唇期
B. 肛门期
C. 性器期
D. 潜伏期
E. 生殖期
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