Chemistry · Man-made Materials (Cement)
वर्ष 1824 में पोर्टलैंड सीमेंट का आविष्कार किसने किया था?
- 1एक जर्मन इंजीनियर
- 2एक ब्रिटिश राजगीर / इंजीनियर✓
- 3एक अमेरिकी इंजीनियर
- 4एक फ्रांसीसी इंजीनियर
सही उत्तर देखें
एक ब्रिटिश राजगीर / इंजीनियर
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