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【单选题】
双肢箍的计算公式是( )A.
2*(a-c)+2*(b-c)+2*6.25d
B.
2*(a-2c)+2*(b-2c)+2*6.25d
C.
2*(a-2c)+2*(b-2c)+2*11.87d
D.
(a-c)+(b-c)+2*6.25d
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