ङ) प्रेरणार्थक क्रिया किसे कहते हैं? समझाइए।
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Find the temperature difference between two sides of a steel plate 4 cm thick, when heat is transmitted through the plate at the rate of 400 k cal per minute per square meter at steady state. Thermal conductivity of steel is 0.026 kcal/m s K.
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पुढील विधाने सकारण स्पष्ट करा. (१) ब्रिटिश काळात वृत्तपत्रे सामाजिक प्रबोधनाची साधने म्हणूनही काम करत होती.
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