to use 【解析】 It's+adj=todosth .为固定句式,此处应用动词不定式短语作句子的真正主语。7. central【解析】修饰地点名词 London应用形容词,故填central8.noisy【解析】be动词后可接形容词,构成系表结构。9.difference【解析】根据设空前的 the可知此处应填difference10.rules【解析】根据设空前的 these可知...
This invention relates generally to metal oxidere-moving composition and more particularly to metal oxide-removing compositions containing a film-forming, water-soluble polymer. BACKGROUND OF THE INVENTION In the past, several metal oxide-removers have been employed. Some of these removers contained,...