色谱仪的测定下限的测定，是在开机基线稳定的情况下，以测试样品时基线噪声的2倍作为仪器的检出限。
参考答案：对
现金等价物是指企业持有的期限短，流动性强，易于转换为已知金额的现金，价值变动风险很小的短期投资。
He didn't tell me _______. [ ]
A. which floor did he live
B. which floor he lives on
C. which floor he lived on
D. which floor he lived
