straps of all glass boxes B, C, and D cannot be unfastened. That is, when unloading glass box A, all other glass boxes must be fixed to ensure that other glass boxes cannot fall down due to shaking and tilting, which will cause personal safety.
4. There are 4 boxes of glass in the container, A, B, C, D. Never unload two boxes of glass on the same wall of the container, so that there is no glass o
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