【简答题】已知下列数据: Mg(s)→Mg(g) S=152.6kJ·mol -1 O 2 (g)→2O(g) D=497.8KJ·mol -1 O(g)→O 2- (g) E=-652.1kJ·mol -1 Mg(g)→Mg 2+ (g) I=2186KJ·mol -1 Mg(s)+ 2(g)→MgO(s) =-600.7kJ·mol -1 试通过Born...
【单选题】把网络192.134.11.0划分为多个子网(子网掩码是255.255.255.128),则全部的子网中可用的主机地址总数是()
【判断题】Function函数过程名可以返回一个计算结果至主程序。
【单选题】The acid rain destroys the protection on tree leaves, which makes the plants more vulnerable to disease.
【简答题】平面机构中,两构件通过 [填空(1)] 接触构成的运动副称为低副,通过 [填空(2)] 或 [填空(3)] 接触构成的运动副称为高副。A. 面B. 点C. 线
【单选题】已知298K时,有Zn(s)+1/2O 2 (g)=ZnO(s),ΔrHmθ═-351.5kJ•mol -1 ,Hg(l)+1/2O 2 (g)=HgO(s),ΔrHmθ═-90.8kJ•mol -1 ,则反应Zn(s)+HgO(s)=Hg(l)+ZnO(s)的ΔrHmθ为()。
【单选题】The plants on the ___ shelf were beyond my reach.
【单选题】If all the plants on the earth die, _______ people _________animals will be able to live.