监控装置主机系统报警，在进行一至二次瞬间关闭监控装置电源30秒以上，且重新启动主机及显示器仍无效的可判断为监控装置故障。
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购买过程是从企业的某些人员认识要购买某种产品以满足企业的某种需要开始的。认识需要由两种刺激引起，其中属于外部刺激的是什么？
Which command encrypts all plaintext passwords?（）
A. Router(config)#password-encryption
B. Router(config)#service password-encryption
C. Router#service password-encryption
D. Router# password-encryptio
因为万物生长靠太阳，所以必须到日坛祭日，祭日于西郊。
A. 正确
B. 错误
The phrase when built in the certificate of vessel’s nationality definitely means（）.
A. when was your vessel built
B. at what time is your vessel building
C. when is your vessel built
D. at what time you built your vessel
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