842 . 機械接頭之接合，首先應將下列何項附件裝於插口端？ (A) 墊料 (B) 承口 (C)押 ( 壓 ) 圈 (D) 橡膠圈。-58題庫

842 . 機械接頭之接合，首先應將下列何項附件裝於插口端？
(A) 墊料
(B) 承口
(C)押 ( 壓 ) 圈
(D) 橡膠圈。

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