Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）. ["97 times greater","94 times greater","10 times greater","2 times greater"]
苏伊士运河的开凿对埃及的经济与世界交通运输业的发展有何重要意义？
未经批准擅自从事认证活动的，予以取缔，处（）的罚款，有违法所得的，没收违法所得。 ["10万元以上50万元以下","5万元以上10万元以下","5万元以上20万元以下","20万元以上50万元以下"]
北部非洲有哪些主要特点？
Combustible gas indicators operate by drawing an air sample into the instrument（）. ["over an electrically heated platinum filament","where it is mixed with nitrogen","where it is ignited by a sparking device","where its specific gravity is measured"]
埃及的棉花为什么闻名于世？
