单项选择题 当以5 mol H2气与4 mol Cl2气混合，最后生成2 mol HCl气。若以下式为基本单元，则反应进度ξ应是： H2(g) + Cl2(g)=2HCl(g)  A. 1 mol B. 2 mol   C. 4 mol D. 5 mol

单项选择题 女婴，因下雪，急产于家中。胎龄35周，出生体重不详，出生12小时换尿布时发现两下肢及臀部皮肤水肿并硬，未吃奶，哭声弱，送医院。查体:体重1900g，发现硬肿范围30%，肛温33℃，腋温34℃，反应差，暂无肺出血、休克。 A.1：4含钠液，20ml/kg，静脉推注   B.2：1等张含钠液，20ml/kg，静脉推注 C.3：1含钠液，150ml/kg，静脉滴注 D.3：2：1含钠液，180ml/kg，静脉滴注

多项选择题 Physical similarity simulation versus numerical simulation what needs to be done in the material gathering step （ ）.A.Calculate the location of key layers, determine the number of layers and horizons for simulationB.Analysis of geological conditions, obtain the comprehensive histogram of coal and rock strataC.Obtain the physical and mechanical properties of rock are through experimentsD.Get a geological overview, identify the goals and problems of the simulation