railway DFCCIL Executive 2025 Mock Test Draftsman Basic Engineering Drawing Drawing Instruments

ड्राइंग शीट को मोड़ने के लिए किस BIS कोड की सिफारिश की जाती है? 

1
IS 11664 - 1989
2
IS 11664 - 1987
3
IS 11664 - 1986
4
IS 11664 - 1981 
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