Which command can be used from a PC to verify the connectivity between hosts that connect through a switch in the same LAN?（） ["ping address","tracert address","traceroute address","arp addre"]
督办工作未落实，造成影响和后果，属于（）问题。 ["红线","A1","A2","B"]
片状马氏体的针长短不一，如何根据马氏体针的大小判断奥氏体晶粒度？
高处作业高度在（）时，称为三级高处作业。 ["30m以上","15～30m","15～25m"]
亚共析钢经10<sup>5</sup>℃/s超速加热后，组织中有未溶解的碳化物，为什么？
破碎工段矿石颗粒大小对磨重的棒磨机有什么影响？
