The orders will throw a lifeline to Britain's shipyards.这些订单将给英国的造船厂注入一线生机。By the 1960s, many shipyards were struggling.到20世纪60年代，许多造船厂都在勉强支撑。Many shipyards will have to close.许多船坞将不得不关闭....
This precipitate dissolves in an excess of aqueous ammonia.这个沉淀能溶解在过量的氨水中.Clearly aqueous preservative systems must possess a fixation mechanism.显然,水溶性防腐剂必须有固定的历程.Activated carbon, alumina are often used to remove many t...