高密度聚乙烯波纹管有何质量要求？
如果将用户或组加入组策略创建拥有者组，用户就能够创建GPO，也能够连接到新的GPO上。
How can rescue personnel detect that a SART is transmitting in the immediate vicinity?（） ["The SART's blips on the PPI will begin arcing and eventually become concentric circles","The DSC unit will react to the SART's signal and respond with the two-tone alarm","The SART can provide an approximate location to within a two nautical mile radius，per IMO standards","The SART signal appears as a target which comes and goes; the effect of heavy swells on a SART"]
分拣作业的方法主要有（） ["按单分拣","批量分拣","整合按单分拣","复合分拣"]
预留孔道的管道质量有何要求？
游泳池池水循环的目的是什么？
