食品中香气成分形成的途径或来源主要有哪几个方面?
参考答案:
食品中香气形成的途径或来源主要有生物合成、酶的作用、发酵作用、高温分解作用、食品调香5个方面。
Though ______money, his parents managed to send him to a key university. [ ]
A. lacked
B. lacking
C. lacking of
D. lacked in
汽轮机油系统着火应按什么步骤进行扑救?