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【单选题】
女孩，5岁，发现心脏杂音。以往健康，发育正常；血压正常。胸骨左缘第2肋间为连续性收缩期杂音，似机器样。X线检查心脏大小正常，肺纹理轻度增粗。X线透视见肺门舞蹈征。在成人手术矫正这种心脏畸形的主要禁忌证是（）A.
差异性发绀，杂音消失
B.
有心力衰竭史
C.
心电图改变
D.
合并发绀型心脏病
E.
高血压
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举一反三
【单选题】The construction of tens of thousands of monumental engineering projects designed to control floods, protect clean water supplies, and provide water for irrigation and hydropower brought great benefit...
A.
designed
B.
protect
C.
protect and provide
D.
brought
【单选题】The construction of tens of thousands of monumental engineering projects designed to control floods, protect clean water supplies, and provide water for irrigation and hydropower brought great benefit...
A.
designed
B.
protect
C.
protect and provide
D.
brought
【简答题】平面机构中的低副引____入个约束,仅保留___个自由度;高副引入______个约束,保留了____个自由度。
【单选题】What is the correct position for the word also in a second request?
A.
Before the subject
B.
Before the verb
C.
After the verb
【简答题】平面机构中的低副引____入个约束,仅保留___个自由度;高副引入______个约束,保留了____个自由度。
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