已知下列反应N2(g) + 3H2(g) = 2NH3(g) (1)1/2N2(g) + 3/2H2(g) = NH3(g) (2) 1/3N2(g) + H2(g) = 2/3NH3(g) (3)的平衡常数分别为 Kθ1 、Kθ2 、Kθ3 ，则它们的关系是 A: Kθ1=Kθ2=Kθ3 B: Kθ1 = (Kθ2)2 = (Kθ3)3 C: Kθ1 =3/2Kθ2 =2/3Kθ3 D: Kθ1 = (Kθ2)1/2 = (Kθ3)1/3

N2(g) + 3H2(g) = 2NH3(g)中N2、H2、NH3的化学计量数分别为（ ） A: 1, 3, 2 B: -1, -3, 2 C: 1, 3, -2 D: -1, -3, -2

在温度T和压力pθ时理想气体反应：（Ⅰ）2H2O(g)＝2H2(g)＋O2(g) Kθ1 （Ⅱ）CO2(g)＝CO(g)＋1/2O2(g) Kθ2则反应：（Ⅲ）CO(g)＋H2O(g)＝CO2(g)＋H2(g)的Kθ3应为 A: 这是单选题 B: Kθ3= Kθ1/Kθ2 C: Kθ3= Kθ1Kθ2 D: Kθ3=(Kθ1)1/2/Kθ2 E: Kθ3= Kθ2/Kθ1

【单选题】In the short transmission line model, the relative size of the sending end voltage Vs and the receiving end voltage Vr depends on the load power factor. Which of the following is correct? Power factor = 0.8 (leading) Power factor = 1 Power factor = 0.8 (lagging) A Vs > Vr Vs < Vr Vs < Vr B Vs < Vr Vs = Vr Vs < Vr C Vs < Vr Vs = Vr Vs > Vr D Vs > Vr Vs > Vr Vs > Vr A. See item A in the problem B. See item B in the problem C. See item C in the problem D. See item D in the problem

[color=#000000]琥珀的用量是∶[/color] A: 15~30 g B: 1.5~3 g C: 0.3~1 g D: 5~15g E: 1~3 g

低盐膳食中,盐的每日摄入量为( )。 A: 1 ~ 3 g B: 2 ~ 4 g C: 1 ~ 4 g D: 0.5 ~ 3 g E: 2 ~ 6 g

模拟调制信号的制度增益从高到低依次排列顺序是（）。 A: A B: VS C: DS D: FM E: A F: VS G: SS H: FM I: F J: DS K: VS L: SSB M: SS N: VS O: A P: FM

反应N2(g) + 3H2(g) = 2NH3(g)的ΔG = a，则NH3(g) = 1/2N2(g) + 3/2H2(g)的ΔG为： ( ) A: a2 B: 1/a C: 1/ a2 D: –a/2

298K时,N2(g)+3H2(g)=2NH3(g),△rHm(1)=-92.38kJ.mol-1,则1/2N2(g)+3/2H2(g)=NH3(g)△rHm(2)=()

已知 N2(g) + 3H2(g) =2NH3(g)；1/2N2(g) + 3/2H2(g) =NH3(g) 和1/3N2(g) + H2(g) =2/3NH3(g) 的平衡常数分别为K1、K2和K3，则它们的关系是： A: K1 = K2 = K3 B: K1 = (K2)2 = (K3)3 C: K1 =2K2 = 3K3 D: K1 = (K2)1/2 = (K3)1/3