题目内容

What is the relationship between Zhang Lan and Yang Xiaoling?Zhang Lan and Yang Xiaoling are______________.

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What is Zhang Lan going to do?She is going to take a__________________ to Nanjing.

What is Zhang Lan's flight number?Her flight number is____________.

When should Liu Hongjun meet Zhang Lan at the airport?Mr. Liu Hongjun should meet Zhang Lan at on ___.

某工人一工作8小时，其中在90dB（A）下工作1小时，在88dB（A）下工作2小时，在84dB（A）下工作2小时，其余时间在78dB（A）下工作，请计算等效连续A声级。（6分）