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| تأثير كهروضوئى ؛ظاهرة كهروضوئية | |||
| تأثير كهروضوئي | |||
| ظاهرة كهروضوئيه | |||
| efecto fotoeléctrico: 4 phrases in 1 subject |
| Antennas and waveguides | 4 |
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