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【单选题】
海关总署11月10日公布今年前10个月我国外贸进出口情况，据海关统计，1至10月，我国进出口总值为23934.1亿美元，将“23934.1”保留二个有效数字约为 [ ]A.
2.3×10 4
B.
0.23×10 5
C.
2.4×10 4
D.
2.4×10 5
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A.
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B.
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C.
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D.
Dogs can see no more than shades of gray.
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A.
Many animals have poor eyesight while their sense of smell, is quite good．
B.
Dogs are color blind.
C.
The human sense of smell is not good.
D.
Dogs can see no more than shades of gray.
【简答题】在影响行业生命周期的技术进步因素中，最重要也是首先需要考虑的是（ ）。
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