Computer · Concrete Technology
निम्नलिखित में से कौन सा सीमेंट कंक्रीट के एक मानक ग्रेड को दर्शाता है?
- 1Fe415
- 2M20✓
- 3OPC 53
- 4CC304
सही उत्तर देखें
M20
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