A thin groove divides the concrete wall into two, right where the square of the golden rectangle is delimited.
一条细槽按黄金比例将水泥墙一分为二。
Magnetic square box advantages: V-groove with a magnetic force can be a fixed measured part, so that more accurate measurements.
型槽带有磁力，可固定被测工件，使测量更加准确。
Magnetic square box advantages: V-groove with a magnetic force can be a fixed measured part, so that more accurate measurements.
型槽带有磁力，可固定被测工件，使测量更加准确。
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