An empirical validation of instructional materials on methods of improving water potability
This study developed and validated supplementary instructional materials on methods of improving water potability for use in the first and second year high school classes. The first lesson included physical, biological, and bacteriological examination of the local water supply. The second lesson...
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| Định dạng: | Luận văn |
| Ngôn ngữ: | English |
| Được phát hành: |
1978.
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| Những chủ đề: |