智能楼宇系统的各子系统调试时安排的培训方法是针对()的培训。
A.管理人员
B.技术人员
C.操作人员
D.工程师
参考答案:D
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.binarytext
B.hypertext
C.plaintext
D.supertext
控制景物曝光范围在胶片()以内,是曝光控制的基本要点之一。
A、感光度
B、宽容度
C、感色性
D、反差性