为了保证信息安全,传输必须使用加密方式,有一种方式其加密、解密原理如下: 明文密

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问题:

为了保证信息安全,传输必须使用加密方式,有一种方式其加密、解密原理如下:

明文密文密文明文

已知加密为yax-2(x为明文、y为密文),如果明文“3”通过加密后得到密文为“6”,再发送,接收方通过解密得到明文“3”,若接收方接到密文为“14”,则原发的明文是________

考点:指数函数模型的应用对数函数模型的应用
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Beijing: The United States and North Korea had their first (1) in four months here this afternoon as part of the (2) negotiations on how to end North Korea’s nuclear program, but diplomats played clown prospects for (3) . The talks are at the Diaoyutai (4) , a sprawling, garden-filled (5) in western Beijing, with negotiators gathering around a giant hexagonal table built to (6) the six delegations. The Chinese placed the Americans and the North Koreans in (7) , which may have facilitated the (8) between Mr. Kelly and Mr. Kim, which took place (9) in the afternoon session. The two spoke for 30 minutes, two Asian diplomats (10) . The early indications of how the talks are going (11) . A South Korean who took part in the meetings described North Korea as "willing to (12) through dialogue." Chinese officials also put a (13) on the talks. "I heard talks this morning and this afternoon were very successful," the Foreign Minister, Li Zhaoxing, told delegates (14) . But Japanese and Russian participants were (15) . The Russian (16) , Aleksandr Losyukov, described the negotiations as (17) . "So far, the countries have put forward a number of (18) , which are (19) the development of these talks," he told Russian reporters in Beijing. "I would not say that I am feeling (20) ."

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按抗肿瘤药的作用原理及来源分,抗肿瘤药可分为()

A.烷化剂

B.抗代谢药物

C.抗肿瘤抗生素

D.抗肿瘤植物有效成分及抗肿瘤金属配合物

E.以上都正确

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道间温度(俗称层间温度)

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下面关于磁共振成像心功能分析技术的扫描技术要点叙述错误的是()

A.采用单次屏气TSE序列在冠状位定位像上作横断面成像

B.以显示左右室及室间隔的矢状面图像为定位图,做平行于室间隔的左室长轴位成像

C.以平行于左室长轴位为定位图,作垂直于左室长轴的短轴位

D.确定所成短轴位合乎心功能分析所需,采用单次屏气2D-FLASH序列,以左室长轴位图为定位图,作垂直于左室长轴的短轴位电影成像

E.扫描层面必须包括心尖至房室瓣口,保证心功能分析准确无误

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流行性脑脊髓膜炎首选()和()。

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