【单选题】04-136自动扶梯扶手带的运行速度相对于梯级、踏板或胶带的速度允许偏差差为( )。
【单选题】The ink has faded with time and so parts of the letter were ______.
【单选题】自动扶梯扶手带的运行速度相对于梯级、踏板或胶带的速度允许偏差为()。
【简答题】扶手带的运行速度相对于梯级、踏板或胶带实际速度的允许偏差为_ ~+_%
【单选题】扶手带运行速度相对梯级或踏板的运行速度偏差为( )。
【单选题】The ink had faded with time and so parts of the letter were illegible.
【单选题】自动扶梯扶手带的运行速度相当于梯级、踏板或胶带的速度允许偏差为( )。
【单选题】About six months later,the letter they were looking forward to ________at last.