57.下列那一項因素最不會影響X光束強度(beam intensity) ?
(A)x光管電流(tube current)
(B)x光管電壓(tube voltage)
(C)瞄準管(aiming cylinder) 厚度
(D)曝光時誾(exposure time)
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統計: A(39), B(33), C(695), D(283), E(0) #2405163
統計: A(39), B(33), C(695), D(283), E(0) #2405163