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【简答题】
若构件1和2在A点构成重合点,则构件2相对于构件1的哥氏加速度的大小和方向如何确定?
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A.
when ventricular pressure exceeds that of the atria
B.
when pressure inside the ventricles is at its lowest
C.
when pressure inside the atria is greater than that inside the ventricles
D.
when pressure is greater in the aorta than in the left ventricle
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【单选题】When do the A-V valves close during the cardiac cycle?
A.
when pressure inside the ventricles is at its lowest
B.
when pressure inside the atria is greater than that inside the ventricles
C.
when ventricular pressure exceeds that of the atria
D.
when pressure is greater in the aorta than in the left ventricle
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