问题
问答题 简答题
煤中含有哪几种主要的元素？
答案
参考答案：
碳、氢、氧、氮、硫。
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煤中含有哪几种主要的元素？
参考答案：
碳、氢、氧、氮、硫。
| 选择恰当的词，并用其正确形式填空。 | |
subjects there in order toget a good job 2 leaving school. Others don't go to school. They 3 go to learn a skill and then they 4 make a living. School education is important (重要的). But 5 one can learn everything from school. A teacher can't teach his students 6 The teacher should let students get knowledge and 7 students how to learn. The teacher 8 to teach them how to read and how to 9 So the- students themselves learn 10 more outside (在……外面) the school. |