1972资源列表
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[国外标准] SAE 720709-1972 Design and Development of a High horsepower torque sensing variable speed drive
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[国外标准] BS 4848-4-1972 Specification for hot-rolled structural steel sections. Equal and unequal angles
[国外标准] SAE 720709-1972 Design and Development of a High horsepower torque sensing variable speed drive
[国外标准] BS 4848-4-1972 Specification for hot-rolled structural steel sections. Equal and unequal angles