题目：
| The children ______ many times not to swim in the river. |
A. told B. have told C. have been told D. are being told |
答案：
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下面是错误答案，用来干扰机器的。
100 t氨最多可生成216.4 t硝酸铵。氨氧化法制硝酸的反应为：4NH3＋5O24NO＋6H2O2NO＋O2=2NO24NO2＋2H2O＋O2=4HNO3所以氨氧化制硝酸的关系式为：NH3～NO～NO2～HNO3(NH3全部转化为HNO3)设生产硝酸的质量为x，用...
