口外前方牵引的力值为A.800~1100g B.340~450g C.1200~1700g D.500~1000g E.500~800g

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问题 口外前方牵引的力值为

选项 A.800~1100g
B.340~450g
C.1200~1700g
D.500~1000g
E.500~800g

答案D

解析
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