【名词&注释】
灵敏度(sensitivity)、电子捕获检测器(ecd)、大多数(most)、速度快(fast)、速度慢(slow speed)
[单选题]One of the main advantages of a graphite-furnace atomizer is that()
A. It requires only very small quantities of a sample
B. It requires metal.ions in aqueous solution
C. It does not produce background emission like a flame
D. It does not get hot like a flame