下列哪一组符号均可表示重量或体积的比例?() ["ppm、ppt","ppb、pph","ppm、ppb","ppb、ppt"]
BSC哪些单元没有备份() ["ET","CLAB","OMU","FDU"]
轧机打捆记录质量检查要素() ["需要翻钢的钢卷只须打单捆","需要翻钢的钢卷必须打双捆","厚度≤1.6mm的,必须点焊内径","厚度≤1.6mm的,不要点焊内径"]
奇骏全系标配ECODRIVE节能驾驶助手。()
以下哪些属于DTAP协议() ["CC","MM","RR","SMS"]
简述反射波法基本原理及其适用范围。