What does the passage mainly discuss? [br] According to the passage, a flashbulb

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问题 What does the passage mainly discuss? [br] According to the passage, a flashbulb can be made to burn longer by using

选项 A、thicker wire
B、more oxygen
C、thinner glass
D、continuous electricity

答案 A

解析

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Whataspectofpaintinginthenineteenthcenturydoesthepassagemainlydiscus