单项选择题

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单项选择题
B
单项选择题
A. A more economical diesel fuel. B. Characteristics of a new type of fuel. C. Where a new energy source is located. D. How to develop alternative energy sources.
A. A more economical diesel fuel.
B. Characteristics of a new type of fuel.
C. Where a new energy source is located.
D. How to develop alternative energy sources.
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