The second heart sound is primarily formed by（ ）
A、the open of the semilunar valves
B、the open of AV valves
C、the closure of AV valves
D、the closure of the semilunar valves
E、none of above
发布时间：2025-04-02 02:55:35
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答案：the closure of the semilunar valves
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