向a mLBaCl2、AlCl3和FeCl3的混合溶液A中,逐滴加入Na2SO4

题型:选择题

问题:

向a mLBaCl2、AlCl3和FeCl3的混合溶液A中,逐滴加入Na2SO4和NaOH混合溶液B,产生沉淀的物质的量n和加入溶液的体积V( B)的关系如下图所示,下列判断正确的是

[ ]

A.加入90 mL B时,A中的金属离子沉淀完全

B.加入110 mL B时,沉淀物仅为BaSO4

C.B溶液中c(Na2SO4):c(NaOH) =1:1

D.当溶液中含有NaAlO2时,V(B)≥100 mL

考点:离子反应
题型:选择题

The Taj Mahal (泰姬陵) is a love story, a sad and beautiful one. If it didn’t exist, we would easily imagine that the story of its construction was simply a fairy tale. Three hundred years ago, there lived an Indian emperor called Shah Jahan. His wife was a beautiful and bright woman whom he loved greatly. Her title was Mumtazl Mahal: its shortened form Taj Mahal, means “pride of the palace”. In the year 1630 this beloved wife of the emperor died. He was so brokenhearted that he thought of giving up his throne. He decided out of his love for his wife, to build her the most beautiful tomb that had ever been seen.

He summoned the best artists and architects from India, Turkey, Persia and Arabia and finally, the design was complete. It took more than twenty thousand men working over a period of 18 years to build the Taj Mahal, one of the most beautiful buildings in the world.

The building itself stands on a marble platform 29 meters square and 6-7 meters high. Towers rise from each of the four corners. The Mahal itself soars another 61 meters into the air. It is an eight-sided building made of white marble.

The emperor planned to build an identical tomb of black marble for himself on the other side of the river connected by a silver bridge. However, his son put him into a prison in the palace before he could finish, and for the rest of his life, he could only gaze across the river at the tomb of his beloved wife.

小题1: The whole passage tells us about ______.

A.a beautiful fairy tale

B.the story of the Taj Mahal

C.white and black marble tombs made for two emperors

D.the love story of Emperor Shah Jahan and his wife小题2:Which of the following statements is NOT true about the Taj Mahal?

A.It was completed quickly owing to the efforts of the best artists and workers.

B.A lot of people took part in the building work.

C.It is a magnificent building.

D.It is a tomb for the emperor’s beloved wife.小题3: The emperor’s own tomb was designed to be ____________.

A.61 meters high

B.eight-sided

C.black-colored

D.white-colored小题4:The emperor _____________.

A.died soon after Taj Mahal died

B.was killed by his son

C.was beloved by his people

D.died after 1648

题型:选择题

解方程

2ⅹ-40=19.2;2ⅹ÷0.65=4.5.

题型:选择题

膜分离技术

题型:选择题

下列选项中,不属于人力资源规划意义的是( )。

A.有助于组织人员的稳定
B.有助于组织发展战略的制定
C.有助于降低人力资本的开支
D.有助于调动组织人员的积极性

题型:选择题

“舌战群儒”是谁的事迹?()

A.亚里士多德

B.柏拉图

C.曹操

D.诸葛亮

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