气相色谱的浓度型检测器有TCD、ECD ;质量型检测器有FID、FPD;其中______使用氢气或者氦气气体时灵敏度较高;______对大多有机物的测定灵敏度较高;______只对有电负性的物质有响应。
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培养细胞的生存条件包括______、______、______、______。
在线速度较低时，分子扩散项是引起色谱峰扩展的主要因素，此时宜采用______的气体作载气，以提高柱效。
气相色谱定量分析中对归一化法要求的最主要的条件是试样中所有组分都要在一定时间内分离流出______，且在检测器中产生信号。
The author sets off the word "Reform"(line 42)with quotation marks in order to
A. emphasize its departure from the concept of settled possessiveness.
B. show his support for a systematic program of change.
C. underscore the flexibility and even amorphousness of United States society.
D. indicate that the term was one of Wilson"s favorites.
E. assert that reform. in the United States has not been fundamental.
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