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  3. What does the passage mainly discuss? According to the passage, the white color of the smoke particles generated by a flashbulb

What does the passage mainly discuss? According to the passage, the white color of the smoke particles generated by a flashbulb

admin2005-01-30  82
问题 What does the passage mainly discuss?
According to the passage, the white color of the smoke particles generated by a flashbulb contributes to
选项 A、rapid cooling
B、bright illumination
C、electrical conductivity
D、intense heat
答案B
解析
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