对于反应:KClO3+5KCl+3H2SO4=3K2SO4+3Cl2↑+3H2O

题型:选择题

问题:

对于反应:KClO3+5KCl+3H2SO4=3K2SO4+3Cl2↑+3H2O,被氧化的氯元素与被还原的氯元素的质量之比为(  )

A.1:5

B.5:1

C.3:1

D.1:3

考点:氧化还原反应的本质和特征氧化还原反应的定义氧化还原反应的计算
题型:选择题
3个
1
4
是______,16米的
3
8
是______米.
题型:选择题

如图所示,起重机的挂钩用四根等长的绳子吊起质量为m的物体,绳子与竖直方向均成30°角,则每根绳子中的张力大小为 

[ ]

A.mg

B.

C.

D.

题型:选择题

In the U.S. Mother’s Day is a holiday celebrated on second Sunday in May. It is a day when children honor their mothers with cards, gifts and flowers. First observance in Philadelphia in 1907,it is based on suggestions by Julia Ward Howe in 1872 and by Anna Jarvis in 1907.

Although it wasn’t celebrated in the U.S. until 1907,there were days honoring mothers even in the days of ancient Greece. In those days, however, it was Rhea, the Mother of the gods that was given honor. Later,in the 1600’s,in England there was an annual celebration called “Mothering Sunday.” It was celebrated during June, on the fourth Sunday ,the servants, who generally lived with their employers, were encouraged to return home and honor their mothers. It was traditional for them to bring a special cake along to celebrate the occasion.  

In the U.S., in 1907 Ana Jarvis, from Philadelphia, began a campaign to establish a national Mother’s Day. Jarvis persuaded her mother’s church in Grafton, West Virginia to celebrate Mother’s Day on the second anniversary of her mother’s death, the 2ed Sunday of May. The next day Mother’s Day was also celebrated in Philadelphia, Jarvis and others began a letter-writing campaign to ministers, businessmen, and politicians asking to establish a national Mother’s Day. They were successful. President Woodrow Wilson, in 1914,made the official announcement recognizing Mother’s Day as a national celebration that was to be held each year on the 2nd Sunday of May.

Many other countries of the world celebrate their own Mother’s Day at different times throughout the year. Denmark, Finland, Italy, Turkey, Australia, and Belgium celebrate Mother’s Day on the second Sunday in May, as in the U.S.

小题1:.Mother’s Day in the U.S. was first celebrated         .

A.in 1872

B.in 1907

C.in the 1600’s

D.in 1914小题2:The underlined word “observance” in the first paragraph probably means  “      ”.

A.celebration

B.principle

C.holiday

D.campaign小题3:According to the passage, which of the following is TRUE?

A.All the mothers were given honor in the days of ancient Greece.

B.Only the servants’ mothers were given honor on Mothering Sunday in England.

C.President Woodrow Wilson announced Mother’s Day as a national celebration.

D.Ana Javis’s mother probably died on the 2nd Sunday of May in 1907.小题4:What could be the best title for this passage?

A.Mother’s Day of the U.S

B.Mother’s Day of the world

C.Ana Jarvis and Mother’s Day

D.Styles of Mother’s Day

题型:选择题

女性,30岁,因右肾结石行ESWL治疗3天后排出结石,两周复查右肾结石已排净,结石成分分析为磷酸盐结石,预防磷酸盐结石的方法是()

A.口服别嘌呤醇

B.口服维生素B6或氧化镁

C.碱化尿液,口服卡托普利

D.碱化尿液,少食动物内脏

E.控制感染,口服氢氧化铝凝胶

题型:选择题

腹壁静脉曲张,脐以上血流方向向上,脐以下血流方向向下,最可能的是()

A.门静脉阻塞

B.下腔静脉阻塞

C.上腔静脉阻塞

D.髂内静脉阻塞

E.髂外静脉阻塞

更多题库