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能够同时分离千种以上蛋白质的技术是

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通过电喷雾将蛋白质离子化的是

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【单选题】Money-market securities have three basic characteristics in common EXCEPTA ().

A. they are usually sold in large denominations
B. they have low default risk
C. they mature in one year or less from their original issue date
D. they are less liquid

【单选题】Most investors are using the () as an interim investment that provides a higher return than holding cash or money in banks.

A. financial market
B. money market
C. capital market
D. debt market

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