单项选择题
A.45＃ B.不锈钢 C.T8或T12 D.T5或者T12
A.单向径向力 B.单向轴向力 C.双向径向力 D.双向轴向力
A.45°～52° B.65°～72° C.90° D.75°-85°
A.150g-550g B.250g-650g C.350g-750g D.450g-850g
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