单项选择题
采用四轮驱动的汽车的脱困能力都优越于普通二驱车()
A、正确
B、错误
采用四轮驱动的汽车的脱困能力都优越于普通二驱车()
A、正确
B、错误
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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