Tert - octylamine was prepared with di - isobutene and hydrocyanic acid as mine feed. The yield was high.以二异丁烯和氢氰酸为主要原料,高收率地制备叔辛胺.This paper discusses the commercialized production methods of several chemicals using hydr...
I would prefer buy computer rather than go on a trip.我宁愿花钱买台电脑而不去旅游的.Mom, may I go on a trip to Beijing?妈妈, 我可以去北京旅游 吗 ?Shall we go on a trip to the Palace Museum?我们去故宫旅行,好 吗 ?...
He said his advice was: 'No heroics, stay within the law'...他说自己的建议是：“不要逞英雄，要遵纪守法。”...the man whose aerial heroics helped save the helicopter pilot...以空中的英雄壮举拯救了直升机飞行员的人Cut it out, Perry. You've performed ...