76.下列何者最差?
(A)pinhole collimator
(B)converging collimator
(C)high resolution parallel hole collimator
(D)general purpose parallel hole collimator
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統計: A(169), B(56), C(27), D(143), E(0) #3492144
統計: A(169), B(56), C(27), D(143), E(0) #3492144