1. پيوندهاي‌ شيميايي‌ (ترکيب‌هاي‌ يوني‌ و مولکولي‌) ويژه‌ي‌ دانش‌آموزان‌ سال‌ دوم‌ آموزش‌ متوسطه‌ و ورود به‌ دانشگاه‌ (رشته‌ علوم‌ رياضي‌ و فيزيک‌)

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