【单选题】When does an American offer a firm handshake to others?
C.
upon greeting and leaving
【判断题】Getting back on top Michael Dell pioneered a new business model at the firm that bears his name. Now he wants to overhaul it. 1 So why, after three years of relative distance as chairman of the board,...
【判断题】《我们看海去》一文中我在空草地上碰到的那个人就是贼,后来被抓。
【单选题】某消防工程施工单位对已安装的消防水泵进行调试,水泵的额定流量为 30L/s,扬程为 100m,系统设计工作压力为 1.0MPa。下列调试结果中,符合现行国家标准《消防给水及消火栓系统技术规范》(GB 50974)的是( )
A.
自动直接启动消防水泵时,消防水泵在 60s 时投入正常运行
B.
消防水泵零流量时,水泵出水口压力表的显示压力为 1.30MPa
C.
以备用电源的切换方式启动消防水泵时,消防水泵在 2min 时投入正常运行
D.
消防水泵出口流量为 45L/s 时,出口处压力表显示未为0.55MP
【单选题】When does an American offer a firm handshake to others ?
C.
Upon greeting and leaving.
D.
Anytime when he wants.
【判断题】( )在国家标准中规定:直流工作接地电阻,交流工作接地电阻以及安全保护接地电阻均不应大于1Ω,防雷保护接地电阻不应大于4Ω。