engineering recuitment NCRTC Junior Maintainer Mock Test Series 2025 Fitter Fasteners Screw Threads

ନକ୍ଲ ଥ୍ରେଡ୍ ର କୋଣ ହେଉଛି ______ ।

1

55°

2

60°

3

30°

4

45°

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