皮皮学，免费搜题
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【单选题】
下列哪项不属于肌原纤维的特点A.
是肌原纤维中更细的丝
B.
仅存在于骨骼纤维中
C.
由粗、细肌丝构成
D.
骨骼肌肌原纤维电镜下可见A带、I带、M带和Z线
E.
在骨骼肌内排列整齐
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