单项选择题
ISO规定标准大气的温度是 ( )
A 20±5℃ B 25±2℃ C 21±1℃ D 20±2℃
A、A 20±5℃
B、B 25±2℃
C、C 21±1℃
D、D 20±2
ISO规定标准大气的温度是 ( )
A 20±5℃ B 25±2℃ C 21±1℃ D 20±2℃
A、A 20±5℃
B、B 25±2℃
C、C 21±1℃
D、D 20±2
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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