11.若聚焦柵板(focused grid)之焦點由X光束中心線向左偏移,此現象所造成的柵切斷(grid
cutoff)稱為:
(A)upside down
(B)off center
(C)off level
(D)off focus
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統計: A(61), B(950), C(52), D(86), E(0) #1053446
統計: A(61), B(950), C(52), D(86), E(0) #1053446