根据汉语提示及英语句子,完成所缺单词。 1. It's a ______ (地图) of China. 2. Let's go to the ______ (动物园). 3. The elephants are ______ (有几分) shy. 4. There are three ______ (盒子) in her room. 5. I like ______ (熊猫) because they are very cute.
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举一反三
【单选题】反应N 2 +3H 2 ≒ 2NH 3 的能量变化如图所示,其热化学方程式正确的是( )
A.
N 2 (g) +3H 2 (g)≒ 2NH 3 (l) Δ H =+2( b + c - a )kJ·mol -1
B.
B .N 2 (g)+3H 2 (g)≒ 2NH 3 (g) Δ H =+2( b - a )kJ·mol -1
C.
N 2 (g)+3H 2 (g)≒ 2NH 3 (l) Δ H =-2( b + c - a )kJ·mol -1
D.
D .N 2 (g)+3H 2 (g)≒ 2NH 3 (g) Δ H =-( a + b )kJ·mol -1