Practice question
निम्नलिखित विकल्पों में से किस पेंसिल ग्रेड का लेड सबसे नरम होता है?
- 14B ग्रेड
- 25B ग्रेड
- 36B ग्रेड
- 47B ग्रेड✓
सही उत्तर देखें
7B ग्रेड
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