SSC SSC JE Civil 2025 Mock Test Series (Paper 1 & Paper 2) Highway Engineering Highway Materials and Maintenance

यदि डोर्री घर्षण परीक्षण में भार में कमी 21 ग्राम है, तो कठोरता का गुणांक कितना होगा?

1

9.5

2

17

3

21

4

13

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