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柯布一道格拉斯生产函数Y=AKαLβ中，符号A表示的含义是( )。

A.资本投放量
B．常数
C．资金产出弹性
D．劳动产出弹性

【参考答案】

B
柯布一道格拉斯生产函数最早是由美国芝加哥经济学家道格拉斯和数学家柯布于20世纪20年代提出的。他们研究了美国......

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听力原文： Learning the language of a country isn't enough. If you want to find out about the manners of your foreign friends, you will probably be surprised just how different they can be from your own. A visitor to India must remember that it is not polite for people to use the left hand for passing food at table. The left hand is for washing yourself. Also in India, you might see a man obviously shaking his head at another to show that he is disagreeing. But in many parts of India a rotating movement of the head is to show agreement. In Bulgaria you shake your head to show 'yes' and nod your head to show 'no'. In Europe it is quite usual to cross your legs while sitting and talking to someone, even at an important meeting. But doing this will cause anger in Thailand. Also touching the head of an elderly person in Thailand is very impolite. Knowing about manners is useful when you are traveling, but you also need to know the language used to express the manners.(30)A．It is important to master a foreign language.B．Crossing one's leg is impolite manner.C．It is important to master the language of a country as well as the manners there.D．Touching the head of an elderly person in Thailand is very polite.

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RSA是一种基于(31)原理的公钥加密算法。PGP协议采用RSA和IDEA两种加密算法组成链式加密体系，优点是(32)，还可以对电子邮件进行认证，认证机制是用MD5算法产生(33)位的报文摘要，发送方用自己的RSA私钥对(34)进行加密。如果发送方要向一个陌生人发送保密信息，但是没有对方的公钥，那么可以(35)。

A.大素数分解
B．椭圆曲线
C．背包问题
D．离散对数

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