浓缩塔投酸前浓镁浓度要达到()。 ["65%~70%","70%~72%","72%~76%","76%以上"]
GSM分组业务中,最小的单位是什么?() ["帧","块","时隙","信道"]
引导接车时的速度有何要求?
中国移动/联通通常给我司制定的全网分组业务下载速率达到15K/S以上实际指的是多少传输速率?() ["15kbits/s","90kbits/s","150kbits/s","120kbits/s"]
吸收塔充液前,()应投入正常运行。 ["闭路循环水系统","蒸氨器","氧化还原反应器","排酸泵"]
计算题:有一根国产白棕绳,直径为19mm,其有效破断拉力TD=22.5kN,当在紧线作牵引绳时,试求其允许拉力是多少?(提示:安全系数K=5.5,动荷系数K1=1.1,不平衡系数K2=1.0)