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【单选题】
在甲乙类功率放大电路中,功放管的导通角为( );A.
2 π
B.
> π
C.
< π
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举一反三
【单选题】According to the author, when a doctor tells a patient to 'return next Wednesday', the doctor is in fact
A.
instructing the patient to buy more medical services.
B.
warning the patient that a hospital stay might be necessary.
C.
advising the patient to seek a second opinion.
D.
admitting that the initial visit was ineffective.
【单选题】According to the author, when a doctor tells a patient to 'return next Wednesday', the doctor is in effect ______.
A.
advising the patient to seek a second opinion
B.
admitting that the initial visit was ineffective
C.
instructing the patient to buy more medical services
D.
warning the patient that a hospital stay might be necessary
【多选题】下列关于主肺动脉隔的描述正确的是
A.
由动脉干和心球的内膜组织局部增生
B.
由左.右球嵴融合形成
C.
为螺旋板状
D.
分隔成为肺动脉干和升主动脉
E.
参与形成半月瓣
【多选题】下列关于肺动脉走行的描述哪些正确
A.
其走行异常是判断右心增大的重要依据
B.
肺动脉主干自前下向后上走行
C.
上腔静脉后方为右肺动脉干
D.
其下方为主动脉弓
E.
与右心室相连
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