ADSL中使用的主要技术是复用技术和(),两种技术必须相结合才能获得完全双向的操作。
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居住用地使用权价值评估时首选()。
A. 形象进度法
B. 成本法
C. 收益法
D. 假设开发法
零线的主干线可以安装熔断器。
A. 正确
B. 错误
电动机械设备按规定接地接零可减少触电事故的发生。
A. 正确
B. 错误
In modern installations, the main engine and the standby auxiliary engines()
A. can be started at low temperature and are free from preheating
B. usually are preheated by steam before being started
C. are kept at a constant temperature and free from preheating
D. are kept at a low temperature to save energy