单项选择题
下列哪种细胞属于永久性细胞
A..肾小管上皮细胞
B..心肌细胞
C..肝细胞
D..表皮细胞
E..造血细胞
下列哪种细胞属于永久性细胞
A..肾小管上皮细胞
B..心肌细胞
C..肝细胞
D..表皮细胞
E..造血细胞
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单项选择题
The long-term average cost of manufacturers is U-shaped because ( )
The long-term average cost of manufacturers is U-shaped because ( )
A.External economic issues
B.External diseconomies
C.Economies of scale and diseconomies of scale
D.The problem of marginal income