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The operations manual is beneficial in case major problems occur that require urgent changes.
当发生重大问题，需要紧急更改时，操作手册可以提供帮助。
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Personnel Safety in Helicopter Operations: Heli-rescue Manual ;
安全人员在直升机业务：贺丽救援手册 ；
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Personnel Safety in Helicopter Operations: Heli-rescue Manual ;
安全人员在直升机业务：贺丽救援手册 ；
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