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【单选题】
关于软X射线摄影,不正确的说法是A.
40kV以下管电压摄影称为“软X射线摄影”
B.
可获得反差良好的软组织X射线照片
C.
软X射线摄影的X射线是由钨靶X线管产生
D.
适用于乳腺组织
E.
高千伏X射线摄影和软X线摄影相同，物质吸收衰减以光电效应为主
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A.
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B.
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C.
任意播地址(anycast address)
D.
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A.
Garden-related expenditure this year is more or less the same as that of last year.
B.
Many retailers are offering deep discounts.
C.
Prices of garden goods tend to remain stable in recent years.
D.
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