Scope definition is ______ .

A) the process of developing a detailed project scope statement as the basis for future project decisions
B) determining the responses needed to perform project activities
C) analysis of activity sequence, duration, and resource requirements
D) a written statement identifying the quality standards relevant to the project

利用被测气体与载气间及被测气体各组分间热导率的差别，而测出组分浓度的是（）。

A.热导式检测器（TCD.

B.氢火焰检测器（FID.

C.火焰光度检测器（FPD.

D.电子捕获检测器（ECD.