以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.Butyraldehyde 1,2 proparediol acetal was synthesized by using stannous chloride as catalyst.以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.Butyraldehyde 1,2 propanediol acetal was synthesized by using st...
In late January a Brobdingnagian battle erupted over a Lilliputian water dweller.1月底,一种小小的水栖生物掀起了一场大战.Alongside it, NASA is developing the Brobdingnagian Ares V , a 380 - ft.与此同时, 美宇航局还在开发“战神5号”火箭....
The pilot wisely decided to return to Farnborough post haste.飞行员明智地决定尽快返回法恩伯勒。The service is being expanded following the success of a pilot scheme.在试验性方案获得成功后，这项服务正在推广中。Luke sat directly behind the pilot and conversed w...
Hypertension nearly triples the risk for men and doubles it for women.高血压将使男性患病风险增至普通风险水平的近三倍(女性为两倍).We shall discuss quadruples, triples, trees, and indirect triples.我们将讨论四元组, 三元组, 树和间接三元组.The method of deducing Pythago...
Bottoming out near Heron Island, a manta ray can hit much higher altitudes too.可以在鹭鸶岛附近潜至最深处的鬼蝠魟,其实可以更上一层楼.More and more of his friends had gone to see the Great Manta.他的朋友中愈来愈多人去观看大章鱼.It a haven for hammerhead ( and ) w...