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【单选题】
经济学分析中所说的短期是指
A.
1年之内
B.
2年之内
C.
全部生产要素都可随产量而调整的时期
D.
至少有一种要素投入量保持固定的时期
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A.
正确
B.
错误
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A.
because
B.
while
C.
if
D.
and
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A.
30,000.
B.
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C.
Approximately 30,000.
D.
Above 30,000.
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【单选题】普通 V 带的基准长度是指皮带的 周长
A.
外侧
B.
内侧
C.
平均
D.
节线(中性层)
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