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  3. What does the passage mainly discuss? [br] The function of the glass in the firs

What does the passage mainly discuss? [br] The function of the glass in the firs

游客2025-02-09  19
问题 What does the passage mainly discuss? [br] The function of the glass in the first flashbulbs was to
选项 A、produce the spark that initiated the flash
B、magnify the light produced by the flash
C、protect the photographer from the heat of the flash
D、keep the metal and oxygen apart before the flash
答案 D
解析
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