单项选择题
A.固定端锚具 B.张拉端锚具 C.工作锚具 D.工具锚具
A.1373N B.882.6N C.980.7N D.490.3N
A.147.1N B.148.5N C.174.1N D.147.5N
A.980.7N B.580.5N C.588.4N D.688.5N
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