铸铁中的碳除溶于铁素体外，其余的碳以渗碳体形式存在，这种铸铁称为（）。 ["白口铸铁","灰铸铁","可锻铸铁","球墨铸铁"]
Based on the network shown in the graphic which option contains the potential networking problem and protocol or setting that can to prevent the problem?（） ["Routing loops, hold down timers","Switching loops, split horizon","Routing loops, split horizon","Switching loops, VTP","Routing loops, STP","Switching loops, STP"]
品味
钢的共析转变、过饱和固溶体的分解，新相长大都是（）。 ["上坡扩散","反应扩散","下坡扩散"]
新《技规》普速铁路部分第363条列车在站内临时停车，待停车原因消除且继续运行时，应按下列规定办理：2.其他列车乘务人员使用紧急制动阀（紧急制动装置）停车时，由车辆乘务员（随车机械师）通知司机开车。（）
磁力选矿
