15.下列何種型式之銅管,其管壁厚度最厚?
(A)K
(B)L
(C)M
(D)N
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統計: A(1054), B(24), C(56), D(35), E(0) #1969282
統計: A(1054), B(24), C(56), D(35), E(0) #1969282