問題詳情
22. The first heart sound is produced at ______.
(A) closing the semilunar valve
(B) the beginning of systole
(C) the end of systole
(D) the beginning of diastole
(E) the end of diastole
(A) closing the semilunar valve
(B) the beginning of systole
(C) the end of systole
(D) the beginning of diastole
(E) the end of diastole
參考答案
無參考答案
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