Eisenhower left the White House and retired to his farm in Gettysburg.艾森豪威尔离开白宫，退隐到他在葛底斯堡的农场。He lives about 60 miles upstream from Oahe, near Gettysburg, South Dakota.他住在奥阿希湖上游约60英里处，靠近南达科他州的葛底斯堡。Your friend already gave...
Isoleucine A nonpolar AMINO ACID, synthesized from threonine.异亮氨酸:是一种非极性氨基酸, 由苏氨酸合成.Mazindol was synthesized by four steps from chlorobenzene and phthalic anhydride an overall yield of 23.4 %.以氯苯和邻苯二甲酸酐为起始原料,经四步工序合成马吲哚,总...