下列除杂质选用试剂和主要操作都正确的是[ ]物质杂质试剂主要操作 A.SiO

发布时间：2017-06-30 12:07 │ 来源：www.tikuol.com

题型：选择题

问题：

下列除杂质选用试剂和主要操作都正确的是[ ]

	物质	杂质	试剂	主要操作
A.	SiO₂	Fe₂O₃	盐酸	过滤
B.	NaHCO₃	Na₂CO₃	盐酸	加热
C.	Fe	Al	氢氧化钠	分液
D.	Fe(NO₃)₂	Ba(NO₃)₂	硫酸	过滤

考点：物质的除杂

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Dear Mrs Zhou, We have been very good boys and girls since you went to hospital.Don’t worry about us.But we miss you a lot.Please get well soon and come back. Your students, Class Three	Dear Cathy, All the best wishes for your sweet sixteenth birthday. Have fun in the party. Judy
Dear Mom and Dad, This is going to be a white Christmas because it has snowed heavily here in New York.Betty invited me to her party this year.It will surely be great fun! Love，David	Dear Johnson and Maria, How is the new place?I started to miss you the day you left.Are you going to have a house warming party? Don’t forget us! Your old friends, The Browns

小题1:What does Mrs. Zhou do?

小题2:Who will join Betty’s party?

C．Maria and Johnson.

D．David’s mom and dad.

小题3:What can we learn from the cards?

A．Mrs.Zhou was ill and has been back from hospital.

B．Judy is sixteen years old.

C．There are at least six people in the Browns’ family.

D．It must be winter now in New York.

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学校木工组有一根圆柱体木料长60dm，横截面的直径是4dm，如果将这根木料按3：4：5锯成3段，最短的一段体积是多少？

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A把一段电阻为1Ω的一根金属丝截成10段，再把这10段并联起来，这样的一组金属丝的总电阻为（）Ω。

A．0.01

B．0.1

C．1

D．10

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如图表示一交流电的电流随时间而变化的图象，此交变电流的有效值是（　　）

A．5A

B．5A

C．3.5A

D．3.5A

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pps抽样

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