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冷床的作用（）。

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Without federal regulations on proper handling procedures, there is no way to assure customers a best practice for e-cycling. Currently the EPA does not have any data on the amount of e-waste being exported----only data on how much is being recycled, which for cell phone is less than 10%.

DNA的两条链是互补的，一条链决定了另一条链的序列。()。

远期汇率与即期汇率套算得计算原理是一致的。()

What is attached in the second e-mail？

A. The final report
B. A copy of Mr. Ericsson"s bank information
C. A reference letter from a bank
D. A list of research team members