निम्नलिखित में से कौन-सा प� – McqOptions

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1.	निम्नलिखित में से कौन-सा पदार्थ बहुत कठोर और बहुत तन्य है ?
A.	कार्बोरण्डम
B.	टंगस्टन
C.	कास्ट आयरन
D.	नाइक्रोम
Answer» E.

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