反应N<sub>2</sub>+3H<sub>2<img src="/Image1/0c/0c9fe8dc41781c369d2468ecbb2a92a7.jpg" /></sub>2NH<sub>3</sub>的平均速率，在下面的表示方法中<em>不正确</em>的是？（）<br>A:<img src="/Image1/e5/e549ca90f54c1b16eb375cb0ac800597.jpg" /><br>B:<img src="/Image1/ce/ce84b91c104715c33193276387130b13.jpg" /><br>C:<img src="/Image1/e2/e26320c8b083161880cd4a790ae0a711.jpg" /><br>D:<img src="/Image1/25/25cf8e7af1a80bdb535ebb2ce92503cd.jpg" />