Environment & Ecology · Environmental Science
घरेलू उद्देश्यों के लिए पानी गर्म करने के लिए निम्नलिखित में से कौन सी प्रणाली सीधे सौर ऊर्जा का उपयोग करती है?
- 1सोलर-डाइजेस्टर (Solar-digester)
- 2भू-तापीय (Geo-thermal)
- 3सौर-प्रकाशवोल्टीय (Solar-Photovoltaic)
- 4सौर-तापीय (Solar-Thermal)✓
सही उत्तर देखें
सौर-तापीय (Solar-Thermal)
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