A.管电压越高射线的最大波长越长
B.对软组织摄影应用高管电压
C.人体的吸收系数是常数
D.高电压摄影得到低对比照片
E.人体组织的吸收系数随管电压升高而升高
[单选题]观察下表,回答问题。对乳腺摄影应用管电压为A.20kVB.30kVC.40kVD.60kVE.120kV
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