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【单选题】
4岁患儿，生长发育正常，胸骨左缘3、4肋间Ⅱ级收缩期吹风样杂音，柔和，卧位较坐位响亮最可能的诊断是：（）A.
室间隔缺损
B.
肺动脉狭窄
C.
动脉导管未闭
D.
法联症
E.
生理性杂音
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皮皮学刷刷变学霸
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【单选题】以 H 2 C 2 O 4 ·2H 2 O 作基准物质,用来标定 NaOH 溶液的浓度。但因保存不当,草酸失去部分结晶水,问用此草酸标定 NaOH 溶液浓度的结果是
A.
偏低
B.
偏高
C.
无影响
D.
不确定
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【单选题】If there is one thing scientists have to hear, it is that the game is over. Raised on the belief of an endless voyage of discovery, they recoil from the suggestion that most of the best things have al...
A.
most of the best things have already been changed
B.
most of the best things remain to be changed
C.
there have never been so many best things waiting to be discovered
D.
most secrets of the world have already been discovered
【单选题】— Some people believe that robots will take over the world one day— What if that is the ______?
A.
thing
B.
result
C.
case
D.
end
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