尊客爱货、()集中反映了铁路行业服务态度和服务质量的具体要求。
A. 热心周到
B. 热情服务
C. 热情细心
D. 热情周到
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热水锅炉上水前应关闭所有()。
A. 放水阀
B. 放气阀
C. 出水阀
D. 安全阀
小信号谐振放大器与谐振功率放大器的主要区别是什么?
According to the basic concept of GMDSS,()can be rapidly alerted to a distress incident.
A. only SAR authorities on land
B. all ships in a very large sea area
C. the nearest coast stations and port radios
D. the SAR authorities ashore as well as ships in the vicinity of the casualty