两个小问题pinch point和sign off？ 看楼主的昵称好像是搞安全方面的，所以摘取一段安全方面对于pinch point的定义供参考： what does "pinch point" mean? "pinch points" exist in any mechanical device that, in its operation, might pose a risk of injury to body parts. a pinch point is defined as any point where it is possible for a body part to be caught between moving and stationary portions of equipment. if a person or body part occupies that space during the pinching movement, there is a high probability of injuries such as fractures, amputations, or even death. pinch point hazards have historically been associated with power presses and large shearing equipment. in reality, a pinch point can be as wide as a doorway or as narrow as the space between the outriggers on a crane. most of the injuries suffered by xxxx employees have involved vehicle doors, locomotive doors, cabinet doors and pin lifters (cut levers). injuries have also resulted from the use of track jacks, rail shears, and lining bars (pry bars) or have been associated with a large assortment of material storage issues. potential pinch points are widespread. the most common are doors and doorways. the pinch point is created when the door closes. for example, injuries occur when fingers or hands are caught in the pinch point between locomotive cab doors and the cab. another common pinch point occurs when materials such as ties are unloaded with a truck crane or similar equipment. injuries occur when employees place their hands on the material being unloaded or when hands and fingers are caught as the materials settle into place.查看更多
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