问题
填空题
在正常生产情况循环气体中O2的含量为（）。
答案
参考答案：0.4%以下
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在正常生产情况循环气体中O2的含量为（）。
参考答案：0.4%以下
| 用方框中所给单词的适当形式填空，每词限用一次(每空一词)。 | |
2. The teacher speaks _____ to the older students so they can always hear clearly. 3. In Australia, you can see lots of _____ in the fields and on the hills. 4. Strauss wrote more than 400 waltzes and his most _____ one was The Blue Danube. 5. Yang Liwei was called "China's _____ astronaut" when he returned to Earth after his journey into space. |
