急性肾功能衰竭少尿期最常见的血镁、磷、钙代谢异常是() ["高镁、高磷、低钙","低镁、高磷、低钙","高镁、低磷、高钙","低镁、高磷、高钙","高镁、高磷、高钙"]
图书馆的书库按放书的层数计算建筑面积。()
精神分裂症中的哪型易与偏执性精神障碍相混淆() ["青春型","偏执型","紧张型","未分型","单纯型"]
疟疾流行的主要区域是() ["亚热带和温带","温带和寒带","寒带","温带","热带和亚热带"]
一患者缺失,制作义齿时将模型向后倾斜,可使颊侧形成() ["Ⅰ型观测线,卡环尖应向近中","Ⅰ型观测线,卡环尖应向远中","Ⅱ型观测线,卡环尖应向近中","Ⅱ型观测线,卡环尖应向远中","Ⅲ型观测线,卡环尖应向近中"]
某厂采用转炉供一台四流方坯铸机生产,平均出钢量为85t,连铸机,的生产铸坯断面为:240×240mm2,拉完一炉钢的时间为32min,钢水比重为7.6t/m3。试求铸机的拉速是多少?