单项选择题
A.源皮距 B.源片距 C.源限距 D.铅挡块高度 E.体表需挡的宽度
A.8CM*15CM B.7CM*15CM C.6CM*15CM D.5CM*15CM E.8CM*10CM
A.5CM*15CM B.4.5CM*15CM C.4CM*15CM D.5CM*10CM E.4CM*10CM
A.10CM*15CM B.8CM*15CM C.6CM*15CM D.8CM*10CM E.6CM*10CM
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