57.套管游離腔(thimble chamber)的腔壁(chamber wall)不宜使用下列何種物質?
(A)石墨(carbon)
(B)電木(bakelite)
(C)塑膠(plastic)
(D)鉛(lead)
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統計: A(87), B(162), C(298), D(1334), E(0) #2742337
統計: A(87), B(162), C(298), D(1334), E(0) #2742337