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多腹板式机翼无长桁。
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Da准数的物理意义是_____________________________与_______________________________________之比。
外扩散有效因子反应了外扩散过程对催化反应总体速率的影响。
Da准数越大，外扩影响越严重，外扩散有效因子越大。
Drills and Skills:But these are early days for the iPhone 6, Apple's latest device, whose bigger screen takes the firm into the "phablet"(平板手机) category of larger phones that are wildly popular with customers.Question: that引导的从句其先行词是？
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