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【单选题】
第一心音的产生主要是由于A.
房室瓣关闭引起的心室壁振动
B.
半月瓣关闭引起的心室壁振动
C.
房室瓣开放引起的心室壁振动
D.
心房收缩引起的心室壁振动
E.
心室收缩，血流冲击房室瓣折返引起的心室壁振动
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Keeping to the high roads, cycling as fast as he could, _____ allowed him to make the trip in record time.
A.
and not stop for rest
B.
as well as not to stop for rest
C.
and not stoping for rest
D.
and stopping not for rest
【单选题】Keeping to the high roads, cycling as fast, cycling as fast as he could, allowed him to make the trip in record time.
A.
and not stop for rest
B.
as well as not to stop for rest
C.
and not stopping for rest
D.
and stopping not for rest
【单选题】Keeping to the high roads, cycling as fact as he could, ________ allowed him to make the trip in record time.
A.
and not stop for rest
B.
as well as not to stop for rest
C.
and not stopping for rest
D.
and stopping not for rest
【单选题】Keeping to the high roads, cycling as fast as he could, and _____ allowed him to make the trip in record time.
A.
and not stop for rest
B.
as well as not to stop for rest
C.
and not stopping for rest
D.
and stopping not for rest
【单选题】Keeping to the high roads, cycling as fast as he could, _______ allowed him to make the trip in record time.
A.
and not stop for rest
B.
as well as not to stop for rest
C.
and not stopping for rest
D.
and stoppin not for rest
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