Computer · Building Materials
भारतीय मानकों के अनुसार, साधारण पोर्टलैंड सीमेंट (OPC) का प्रारंभिक जमाव काल (initial setting time) कितने मिनट से कम नहीं होना चाहिए?
- 140 मिनट
- 220 मिनट
- 330 मिनट✓
- 410 मिनट
सही उत्तर देखें
30 मिनट
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