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问题 单项选择题

实测的调速器静特性曲线在转速上升和下降时不是一条曲线而是两条曲线，往返两条曲线之间的部分，叫做（）。

A、非线性度

B、不均匀度

C、转速死区

D、放大系数

答案

参考答案：C

问答题 简答题

简述婴幼儿腹泻的发病机制。
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单项选择题

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. There are two types of key technology: private key and public key. Private-key encryption methods are called (71) ciphers, information is encrypted with (72) both the sender and receiver hold privately. Public-key encryption methods are called (73) ciphers, (74) created for each user, encryption key and decryption key are (75)

A．a key

B．two keys

C．three keys

D．four keys
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