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【单选题】
下面关于心包的正常表现的说法正确的是（）。A.
表现为心包外脂肪层和心外脂肪层之间弧形的高信号影
B.
心包厚度在舒大于收缩期
C.
心包厚度一般不超过2mm
D.
左心室前面的心包最常见
E.
心包上隐窝位于肺静脉前、后方
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