The necessary material of 2 - ( 2 - methoethyl ) acetaldehyde diethyl acetal was synthesized in addition.另外还合成了必需原料 2- ( 2- 甲氧基乙氧基 ) 乙醛二乙醇缩醛.Butyraldehyde 1,2 propanediol acetal was synthesized by using stannous chloride...
Food for the ordinary Soviet troops and NCOs was very poor.苏联普通士兵的伙食很糟糕。Gorbachev failed to keep the component parts of the Soviet Union together.戈尔巴乔夫没能把苏联各成员国团结在一起。In 1990, 200,000 Soviet Jews resettled on Israeli terr...
In most languages adjectives have slightly different spellings for masculine and feminine.在多数语言中，形容词的阳性和阴性的拼法略为不同。He was handsome and strong, and very masculine.他英俊强壮，富有男子汉气概。The opera singer has a deep, booming , mascul...