A . 用犬夹夹住头部,使犬头向下,再套上犬链B . 用犬夹夹住颈部,使犬头向上,再套上犬链C . 用犬夹夹住颈部,使犬头向下,再套上犬链D . 用犬夹夹住头部,使犬头向上,再套上犬链E . 用犬夹夹住颌部,使犬头向下,再套上犬链
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