问题
问答题 简答题
在进行粉尘采样时，为使采样具有代表性，必须遵循的原则有哪些？
答案
参考答案：
（1）保持等速采样；
（2）采样嘴方向与烟气流向要一致；
（3）尽量减少采样管形状对气流的影响；
（4）采样嘴大小要合适。
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在进行粉尘采样时，为使采样具有代表性，必须遵循的原则有哪些？
参考答案：
（1）保持等速采样；
（2）采样嘴方向与烟气流向要一致；
（3）尽量减少采样管形状对气流的影响；
（4）采样嘴大小要合适。
| 请先阅读下面短文，掌握其大意，然后从方框中所给的词中选出最恰当的10个，用其适当形式填空。 每个词限用一次。 | |
to see me because they are sad or nervous. Sometimes 2. helps. Sometimes talking helps. But many doctors 3. that music can help people feel better. I asked a few of my patients (病人) how music helps them. "Sometimes I was 4. when I was a child. My family said, "Play your feelings on the piano!" Sometimes I play a loud 5. on the piano. Soon I feel calm (平静的). I can laugh and cry through my 6. on the piano. It's natural for me. It's like breathing (呼吸)." "Listening to music helps me feel 7. . I like to listen to music and dance when I 8. my house." "I play the violin. I like playing at night 9. it is quiet. After playing I am tired and I am happy. I always sleep 10. after playing my violin." Are you a musician? Good! Keep playing. If you are not a musician, listen to music and sing or dance. It's good medicine. |