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【单选题】
患者男性，50岁。经常发生肾绞痛、血尿，疑为肾结石，需做静脉肾盂造影。造影前准备下列哪项正确
A.
清洁灌肠
B.
2天前禁食
C.
检查前憋尿
D.
鼓励饮水
E.
需做碘过敏试验
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B.
Students should rush to click on the vanishing doors before they vanished.
C.
Students should cooperate with other players.
D.
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