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【单选题】
慢肌纤维与快肌纤维相比,其形态特征是
A.
肌纤维直径较大,由α神经元支配
B.
肌纤维直径较小,血管的密度高
C.
肌纤维直径较大,线粒体数量多
D.
肌纤维直径较小,肌浆网发达
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A.
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B.
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B.
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