- Collar
- Heading
- Inset
- Scaffold
- 120 dB (A)
- 130 dB (A)
- 140 dB (A)
- 115 dB (A)
- 90 dB (A)
- 85 dB (A)
Q) The starting point of a vertical shaft at the grounding surface is called ________
Solution:
(a) Collar
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