正常人血浆钙含量为mmol/L(mg/dl)() ["0.50~1.0(2~4)","1.0~1.75(4~7)","1.75~2.25(7~9)","2.15~2.57(8.6~10.3)","2.75~3.25(11~13)"]
经济批量法是指某种物料的订购费用和()之和为最低时的最佳批量法。 ["制造费用","生产费用","保管费用","运输费用"]
当决定一件事情的所有条件中有一个或一个以上具备时,这件事情就会发生,这种因果关系被称为()逻辑。 ["“与”","“非”","“或”","“否”"]
活塞式外部润滑油粘度的选择,主要是考虑维持轴承液体润滑的形成,一般可应用粘度级为()mm2/s(50℃)的抗磨液压油 ["20~30","30~40","40~50","50~60"]
胃、十二指肠溃疡病穿孔引起的急腹症早期症状中,下列哪项是错误的() ["腹肌紧张","呕吐","早期出现休克症状","发热","肠鸣音消失"]
传感器是如何分类的?