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设P0为两曲线x(s)与设k(s0)≠0．证明：曲线C：x(s)(s为其弧长)与已给球面(球心为m)在s0有2阶接触其中 设k(s0)≠0．证明：曲线C：x(s)(s为其弧长)与已给球面(球心为m)在s0有2阶接触 其中t可以任意选定．上式右边当固定s0到一条直线，称为曲线x(s)在s0处的曲率轴或极轴，而点 称为曲率中心，以曲率中心为圆心、 为半径的圆落在密切平面上，称为曲线x(s)在s0处的密切圆(见习题1．4．3图)．(2)设k(s0)≠0，τ(s0)
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举一反三
【简答题】According to G Leech, ______meaning refers to logic, cognitive, or denotative content.(北二外2005研)
【判断题】In terms of where dialect speakers are from, dialects can be classified into regional dialects, social dialects and British Isles dialects.
A.
正确
B.
错误
【简答题】According to G Leech, ______ meaning refers to logic, cognitive, or denotative content.
【单选题】Chinese Dialects(方言) 1．The enormous differences in Chinese dialects have been a continuing problem ever since China became an empire in 221 B．C．, and it is one big reason why the country has remained ...
A.
Dealing with the Problem of Various Dialects
B.
Difficulties in Learning Chinese
C.
Features of Chinese Dialects
D.
Differences in Chinese Dialects
E.
Dialects as Heart of the Problem
F.
Ways of the Government to Tackle the Problem 第 23 题 Paragraph 1____。
【简答题】A．expressions B．remarks C．language D．dialects
【简答题】双阀口式中继阀供风阀室经总风遮断阀通总风,排风阀室通 。
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