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问题 单项选择题

如图6-29所示，在Ⅲ类场地上建一座高为100m的钢筋混凝土烟囱。设防烈度为7度，远震，Tg=0.55s，烟囱自重的标准值Gk=18738.8kN，筒身的重心C距基石出顶面H0=37.7m。

 

房屋顶部侧移最接近于（）mm。

A．13.5

B．14.4

C．15.3

D．16.1

答案

参考答案：D

解析：

单项选择题

In a public-key cryptosystem, (71) encrypted with the public key can only be deciphered with the private key from the same (72) . Conversely, (71) encrypted with the private key can be decrypted only with the public key. Users can make their public keys (73) available or place them at a key distribution center or others to access. However, the private key must be (74) safe. In public-key systems there’s no (75) to find a safe channel for communicating a shared secret key.

A. free B. freelyC. locally D. partly
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问答题 简答题

影响世界市场价格的基本因素分析。
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