下列反应既是氧化反应又是化合反应的是[ ]
A. 点燃镁作照明弹
B. 点燃蜡烛照明
C. 燃烧磷作烟幕弹
D. 燃烧乙炔产生高温火焰
AC
Believe it or not, the matter, ________ we argued for a long time, was in fact related to our study.
A．over it
B．with them
C．about which
D．for which
在FID中，由于氢气燃烧，产生大量水蒸汽。在使用时氢焰离子化检测器的温度应大于（）℃。
A.50
B.80
C.120
D.200
