已知甲、乙、丙、丁四种溶液分别是Ba(OH)2溶液、MgSO4溶液、Na2CO3

题型:选择题

问题:

已知甲、乙、丙、丁四种溶液分别是Ba(OH)2溶液、MgSO4溶液、Na2CO3溶液和稀HCl中的一种.甲、乙混合有白色沉淀出现;乙、丙按一定比例混合后所得液体的导电性几乎为零.则甲、乙、丙、丁四种溶液分别是(  )

A.Ba(OH)2、MgSO4、Na2CO3、HCl

B.Na2CO3、Ba(OH)2、MgSO4、HCl

C.HCl、MgSO4、Ba(OH)2、Na2CO3

D.Ba(OH)2、Na2CO3、HCl、MgSO4

考点:物质的鉴别
题型:选择题

You may know May Day, but do you know Lei Day? Like May Day, Lei Day is also celebrated (庆祝) on May 1st. People wear leis (花环) on this day. A lei is a big circle usually made of flowers . On Lei Day, people give leis to each other. Where do you know this holiday is celebrated? Hawaii, of course! People give leis on birthdays, weddings (婚礼) and as a way to say "I love you". In 1928, a writer, Don Blanding, wrote an article saying that this tradition should become a holiday. Another writer, Grace Tower Warren, thought of the idea of celebrating this day on May 1st and said, "May Day is Lei Day."On this day in 1928, people wore leis and celebrated with music, dancing and a lei-making competition. The next year, Lei Day became a public (公共的) holiday. Today, people still celebrate Lei Day in Hawaii. We hope they all have a happy May Day and a happy Lei Day!

小题1:The underli ned word "circle" can be replaced (替代) by "_________".

A.ring

B.card

C.garden

D.watch小题2:What do people give each other on Lei Day?

A.Clothes.

B.Books.

C.Leis.

D.Cakes.小题3:Lei Day became a public holiday in _____.

A.1928

B.1929

C.1930

D.1931小题4:Which of the following is TRUE according to the passage?

A.Lei Day is on the day after May Day.

B.Lei Day was first celebrated in 1928.

C.Don Blanding said "May Day is Lei Day".

D.People all over the world celebrate Lei Day.小题5:What is the passage about?

A.Lei Day in Hawaii.

B.May Day in Hawaii.

C.How to make a lei.

D.How to celebrate May Day.

题型:选择题

(1).呆小病()
(2).晕动病( )
(3).抑制排卵( )
(4).甲状腺危象( )

A甲状腺激素

B雌性激素+孕激素

C苯海拉明

D大剂量碘剂

题型:选择题

点接触钢丝绳呈点接触状态,钢丝易破断,使用寿命降低,故在起重运输作业中很少使用。

题型:选择题

熟料中的碱含量高,易造成窑内物料固相反应困难。

题型:选择题

关于神经症,不正确的叙述是

A.多数伴有人格障碍

B.多在强烈心理刺激下发病

C.症状的特异性较差

D.起病一般较急

E.患者的社会功能不受影响

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