Heartsaver First Aid Part I
Progress Indicator:
 
Question 4 of 22
4. In shafts less than 100 feet deep, used by employees for the purpose of ingress to or egress from the mine, steps shall have of an average tread of _______ inches and a rise of _______ inches. (Section 274)
Choices:
- twelve, nine
- ten, nine
- twelve, ten
- ten, eight
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