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美国Deltronic公司生产6000多种不同尺寸的高精度圆柱形塞规。每一塞规的尺寸都绝对地保证在(?)毫米的公差范围内,表面粗造度约0.025微米(相当于(?)14—译者)。
Deltronic company in the United States produced more than 6,000 different sizes of high-precision cylindrical plug gauge. The dimensions of each plug gauge are absolutely guaranteed to be about 0.025 microns (equivalent to (?)) Within a tolerance of (?) Millimeters.