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已知下列两个反应： a．C 2 H 2 (g)＋H 2 (g)＝C 2 H 4 (g) ΔH＜0 b．2CH 4 (g)＝C 2 H 4 (g)＋2H 2 (g) ΔH＞0 判断以下3个热化学方程式ΔH1、ΔH2、ΔH3由大到小的顺序是__________________________________。 ①C(s)＋2H 2 (g)＝CH 4 (g) ΔH1 ②C(s)＋1/2H 2 (g)＝1/2C 2 H 2 (g) ΔH2 ③C(s)＋H 2 (g)＝1/2C 2 H 4 (g) ΔH3
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【简答题】Today you can do nearly all your banking by using your smart phone. Many of the major banks allow you to pay bills or transfer funds with a smart phone. Experts say that about 70% of Americans will us...
【简答题】Today you can do nearly all your banking by using your smart phone. Many of the major banks allow you to pay bills or transfer funds with a smart phone. Experts say that about 70u/oof Americans will ...
【简答题】经纬仪竖盘是全圆顺时针注记,盘左位置视线水平时竖盘数为90°当竖盘读数为L时,则竖直角为_____。
【单选题】If a bank desires to hold no excess reserves, the reserve requirement is 5 percent, and it receives a new de-posit of $1,000
A.
its required reserves increase by $50.
B.
its total reserves initially increase by $1,000.
C.
it will be able to make a new loan of up to $950
D.
All of the above are correct.
【简答题】研究领导特性的代表人物为 。
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