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问题 单项选择题

无人机制造商编写的随机文档《无人机所有者/信息手册》（）

A.可以替代《无人机飞行手册》

B.一般情况下可以替代《无人机飞行手册》

C.不能替代《无人机飞行手册》

答案

参考答案：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.

（74）是（）

A.keep

B.keeped

C.keeping

D.kept
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单项选择题

完成骨塑形期在儿童需要（）

A.1～2年

B.2～4年

C.3～4年

D.半年

E.3～12个月
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