单项选择题

“Failure to do so would ____ the United States to second-class status in the scientific community and threaten economic growth and prosperity for future generations of Americans,” he wrote.

A、charter
B、relegate
C、unbutton
D、abdicate

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单项选择题

Fair and(1) competition in government procurement around the world is good business and good public policy. Competitive pricing, product(2)and performanceimprovements result from competitive practices and help ensure that government authoritiesget the best (3)for the public they serve.
空白（3）处填（）
A. help
B. server
C. value
D. policy

灵敏度可用最低检测限(量)与最低检测浓度表示。

答案：灵敏度是指测量系统对被测量变化的响应程度，通常用最低检测限（Limit of Detection, LOD）或最低检测浓...