单项选择题
A.领眼锥体 B.锥体 C.领眼体 D.领眼磨鞋
A.0.5~1kN B.2~3kN C.10~30kN D.30~50kN
A.152mm B.156mm C.159mm D.160mm
A.106mm B.108mm C.110mm D.112mm
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