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问题 多项选择题

下列关于异步电动机的机械特性的说法中，正确的是（）。

A.转矩与转差率成反比

B.转矩与电压的平方成正比

C.转矩与转子电路电阻有关

D.转矩与转差率有关

答案

参考答案：B, C

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.

（71）是（）

A.binarytext

B.hypertext

C.plaintext

D.supertext
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判断题

当汽车载质量或拖挂总质量增加时，汽车的百公里油耗增加。
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