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【单选题】
慢性风湿性瓣膜病常见的联合瓣膜损伤是A.
二尖瓣、三尖瓣及主动脉瓣
B.
二尖瓣与三尖瓣
C.
二尖瓣与主动脉瓣
D.
主动脉瓣与肺动脉瓣
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【单选题】Merchant vessels can operate in three basic ways，but ()is not one of them.
A.
liners
B.
tramps
C.
specialized vessels
D.
passenger ships
【单选题】f the books, one is written by a young writer and______by an old one.
A.
other three
B.
three other
C.
the other three
D.
the three other
【简答题】There are various ways in which individual economic units can interact with one another. Three basic ways may be described as the market syste m, the administered system, and the traditional system. I...
【单选题】One of the three basic parts of a neuron is the
A.
axon
B.
myelin
C.
pons
D.
dura mater
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