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问题 单项选择题

城市给水设施布置形式分为( )形式。

A．统一给水系统、分质给水系统、分区给水系统、分任给水系统

B．统一给水系统、分质给水系统、分区给水系统、循环给水系统

C．统一给水系统、分质给水系统、分压给水系统、循环给水系统

D．统一给水系统、分区给水系统、分压给水系统、循环给水系统

答案

参考答案：C

单项选择题

从农业用地变为建设用地( )。

A．很困难

B．较为容易

C．很容易

D．相当困难
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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.

A．more

B．necessary

C．need

D．space
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