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The protection appliance has a wedge-shaped fixture block with a side surface similar to a right-angled triangle;
它有一个侧面近似 为直角三角形的楔形卡块；
youdao
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The protection appliance has a wedge-shaped fixture block with a side surface similar to a right-angled triangle;
它有一个侧面近似 为直角三角形的楔形卡块；
youdao