28.當超音波的頻率越高,則下列敘述何者正確?
(A)穿透力較好,但解析值較差
(B)穿透力及解析值都越好
(C)穿透力較差,但解析值較好
(D)穿透力及解析值都越差
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統計: A(447), B(68), C(1406), D(176), E(0) #2403334
統計: A(447), B(68), C(1406), D(176), E(0) #2403334