将两种气态烃组成的混合气体0.1mol,完全燃烧后得到0.16mol二氧化碳和3

题型:选择题

问题:

将两种气态烃组成的混合气体0.1mol,完全燃烧后得到0.16mol二氧化碳和3.6克水, 则混合气体中          ( )

A.混合气体中一定有甲烷

B.混合气体中一定有甲烷和乙烯

C.混合气体中一定有乙烷

D.混合气体中一定有乙炔

考点:结构简式结构式
题型:选择题

在实际工作中,常用于分离石膏与塑料材料的分离剂是()。

A.藻酸盐水溶液

B.皂甲溶液

C.甘油

D.凡士林

E.乙二醇

题型:选择题

市场上有一种加酶洗衣粉,即在洗衣粉中加入少量的碱性蛋白酶,它的催化活性很强,衣物的汗渍、血迹、奶渍、油渍遇到它,皆能被水解除去。下列衣料中不能用加酶洗衣粉洗涤的是

①棉织品 ②毛织品 ③腈纶织品 ④蚕丝织品 ⑤涤纶织品[ ]

A.①②

B.②④

C.③④

D.③⑤

题型:选择题

证券投资基金的资金主要投向( )。

A.实业

B.邮票

C.有价证券

D.珠宝

题型:选择题

三、完成句子。阅读下面短文,根据短文提供的信息,完成下列各题。共4题,每题1分,共4 分。 Taxes are a big part in the United States,Most Americans pay city taxes,state taxes, social security taxes,sales taxes...,and the list seems endless The biggest tax for most Americans is that on the money they earn——the income tax.The personal income tax is called a“progressive tax”because it takes more from those who earn more.For example,a person who earns about 3,500 dollars a year will pay a tax of only about 3 5% of earning,but of the same person earned 85,000 dollars a year,he would pay an income tax of 35%. Over the years the income tax has become more and more difficult for people to understand.Almost one half of all Americans now have to pay experts to prepare their tax reports in fact,preparing taxes and giving tax advice have become a big industry in America.

A.taxes which are too many to list

B.taxes either to the cities or the states they live in

C.so many kinds of taxes that they even don’t know the names

D.several kinds of taxes

题型:选择题

路试法可以测汽车动力性,在室内测量时一般采用()测量

A、测力式底盘测功试验台

B、惯性式底盘测功试验台

C、两者皆可

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