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  • This document contains general information about the topics discussed herein. This document is not an application manual and does not contain a complete statement of all factors pertaining to those topics. This installation, operation, and maintenance of arc welding equipment and the employment of procedures described in this document should be conducted only by qualified persons in accordance with applicable codes, safe practices, and manufacturer’s instructions. Always be certain that work areas are clean and safe and that proper ventilation is used.

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  • Tham khảo sách 'handbook for resistance spot welding', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • A substantial number of older persons report insecure balance and experience falls and fear of falling. Prospective studies indicate that 20–30% of those over age 65 fall each year, and the proportion is even higher in hospitalized elderly and nursing home patients. Each year 8% of individuals 75 suffer a serious fall-related injury. Hip fractures often result in hospitalization and nursing home admission. For each person who is physically disabled, there are others whose functional independence is constrained by anxiety and fear of falling.

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