题目：
M型超声心动图二尖瓣前叶运动曲线上A峰对应哪个心脏运动时相（）
A.等容舒张期
B.快速舒张期
C.心房收缩期
D.缓慢舒张期
E.心室收缩期
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
M型超声心动图二尖瓣前叶运动曲线上A峰对应哪个心脏运动时相（） A.等容舒张期 B.
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