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单项选择题

Which one of the following cells arises from monocytes

A．Plasma cell
B．Fibroblasts
C．Lymphocytes
D．Macrophages
E．Mast cell
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单项选择题Which of the following statements concerning mature skeletal muscle is FALSE

A．The cells are multinucleated
B．A sarcomere is the region between two successive Z disks
C．The nuclei are centrally located
D．Myofidrils display a characteristic crossbanding pattern
E．Actin, myosin, troponin, and tropomyosin are present