LF炉用石墨电极的电阻率()。 ["越高越好","越低越好","无影响","电流有关"]
英制体积单位bbl换算成公制单位m3的换算系数为()。 ["0.150;","0.169;","0.159;","0.155。"]
波形声音文件的扩展名是() ["A、.txt","B、.wav","C、.jpg","D、.bmp"]
下列哪种系统只纪录上一航段故障信息() ["A.1类系统;","B.2类系统;","C.3类系统。"]
转炉炉渣粘度大时,炼钢化学反应速度()。 ["加快","变慢","无变化","与粘度无关"]
试述排卵过程及排卵后卵细胞的命运。