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【单选题】
6岁男孩，生后有哭闹后青紫。6个月后青紫渐明显，平时喜蹲踞，哭吵时有突发呼吸急促、青紫加重，严重时伴昏厥。此次因同样发作急诊住院。体检：口唇，指、趾甲青紫，杵状指、趾，胸骨左缘第2～3肋间Ⅰ～Ⅳ级收缩期喷射性杂音，肺动脉瓣第二心音减弱。上述患儿杂音形成是由于（）A.
血液经室间隔缺损自流入右室
B.
血液经室间隔缺损自右室流入
C.
经主动脉的血流增多
D.
右心室流口道狭窄
E.
右心室肥厚收缩力量增强
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举一反三
【判断题】Limited exposure to UVB reduces the skin’s ability to synthesize vitamin D.
A.
正确
B.
错误
【判断题】Limited exposure to UVB reduces the skin’s ability to synthesize vitamin D.
A.
正确
B.
错误
【简答题】Rockets were first used in war in ______ .
【简答题】The ancient Egyptians are supposed ________ rockets to the moon. A) to send B) to be sending C) to have sent D) to have been sending
【简答题】People tend to ignore the delayed effects of exposure to chemical because ________. A) limited exposure to them does little harm to people’s health B) the present is more important for them than the f...
【单选题】Which of the following statements are TURE of limited liability companies?1 The company’s exposure to debts and liability is limited.2 Financial statements must be produced.3 A company continues to ex...
A.
1 and 2 only
B.
1 and 3 only
C.
2 and 3 only
D.
1, 2 and 3
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