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【单选题】
关于高千伏摄影叙述错误的是A.
可获得低对比照片
B.
可延长球管寿命散射线多
C.
利于病人防护
D.
降低照片清晰度
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【单选题】_____ against the coming hurricane, they didn't dare leave home.
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B.
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in as much as
【单选题】____ against the coming hurricane, they didn't dare leave home.
A.
Warned
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Having warned
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To warn
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