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CSLB B- License Exam Questions and Answers Already Passed A ladder should extend a minimum of _____ above the top of a trench or excavation. ✔✔1' According to OSHA, shoring lumber shall be ____. ✔✔Select structural cal/OSHA inspectors cannot, under most circumstances: ✔✔Enter a business outside of normal business hours. Every employer is required to post Material Safety Data Sheets: ✔✔on each job site Handrails must be installed on all open side of a scaffold if workers are subject to falls of _____ or more. ✔✔5' When boom-type equipment is in operation, how close can it be to high voltage power lines? ✔✔10' How should you store oil