当心包腔内蓄积液体时，在心尖部，随心脏的搏动，振荡液体，而产生心包拍水音。
查看答案
健康状态下，第一心音的音调较低，持续时间较长，音尾延续。
A. 对
B. 错
Letters and appeared in the second half of the 17th century.
A. poetry
B. dramas
C. diaries
D. essays
The Pilgrim's Progress is masterpiece.
A. John Milton
B. John Donne
C. John Bunyan
D. John Dryden
There are three types of poets in the literature of the English bourgeois revolution. The revolutinary poets are .
A. Puritan poets
B. Cavalier poets
C. Metaphysical poets
D. Puritan and Metaphysical poets
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