以焦油苊为原料,研制萘酰亚胺型荧光 增白剂.Naphthoylimine Fluorescent Whitening Agent ( FWA ) can be made from tar - acenaphthene.目的: 了解泰安市面粉中增白剂的添加情况.Objective : To understand the brightening agent adding condition of flour in Taian.去污力强, 对...
我用拇指指甲把台灯上的螺钉拧紧了。I used my thumbnail to tighten the screw on my lamp.他已经快把螺丝帽拧下来了。He had unscrewed the caps most of the way.将混合物拧成一段段的香肠，不要把皮弄破。Twist the mixture into individual sausages without splitting the skins....
I cannot bear to leave him alone.我不忍心让他独自留下。Who has esten up my porridge? " hollers Daddy bear in a very loud voice. "谁吃了我的粥? 熊爸爸用很响的声音 哇哇 大叫.This bridge can bear the weight of the heaviest lorry.再重的卡车,这座桥也能吃得住.I have li...