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huangyhg

2009-09-15 12:12 PM

permissible stresses for excavator

permissible stresses for excavator
i am looking for the standarts about the permissible stresses for earth moving machinery like excavators for different materials.(e.g 1/3 of sy).are there any standart about that???

所有的时间均为北京时间。现在的时间是 04:11 PM.