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प्रश्न
______ is the first scientific invention of man.
रिक्त स्थान भरें
उत्तर
Stone wheel is the first scientific invention of man.
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क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
______ is the first scientific invention of man.
Stone wheel is the first scientific invention of man.