下列反应对应的离子方程式书写正确的是()。 A.漂白粉露置在空气中失效:ClO-

题型:选择题

问题:

下列反应对应的离子方程式书写正确的是(  )。

A.漂白粉露置在空气中失效:ClO+CO2+H2O=HClO+HCO3

B.氢氧化钡溶液与硫酸氢钠溶液反应后溶液恰好为中性:Ba2+H+SO42+OH=BaSO4↓+H2O

C.Na2O2与H2O反应制备O2:Na2O2+H2O=2Na+2OH+O2

D.在强碱性溶液中次氯酸钠与Fe(OH)3反应生成Na2FeO4:4OH+3ClO+2Fe(OH)3=2FeO42+3Cl+5H2O

考点:离子方程式
题型:选择题
计算:(1)lg25+lg2•lg50+(lg2)2
(2)(2
1
4
)
1
2
-(-2009)0-(
27
8
)-
2
3
+(
3
2
)-2
题型:选择题

词汇(10分)

小题1:I hope you and your classmates will enjoy ________(you) during your trip.

小题2:Not everyone is as ___________(humour) as Mike.

小题3:-----Are you better today?-----No, I am even _______(ill) now.

小题4:Li Fang is the _________(shy) of all the girls in her class.

小题5:Let’s go and ________(cheerful) for your school volleyball team.

小题6:After a long time and much effort, the climbers ____________(final) reached the top.

小题7:Look! Those_________(swim) are trying to swim across the lake.

小题8:For Linda, __________(keep) fit is not easy because she is very lazy.

小题9:Jim is always willing_______(help) his classmates with their problems

小题10:________ (luck), the climbers helped him to come down from the hill.

题型:选择题

某同学探究弹力与弹簧伸长量的关系。

(1)将弹簧悬挂在铁架台上,将刻度尺固定在弹簧一侧,弹簧轴线和刻度尺都应在______方向(填“水平”或“竖直”);

(2)弹簧自然悬挂,待弹簧______时,长度记为L0,弹簧下端挂上砝码盘时,长度记为Lx;在砝码盘中每次增加10g砝码,弹簧长度依次记为L1至L6,数据如下表表:

表中有一个数值记录不规范,代表符号为_______。由表可知所用刻度尺的最小长度为______。

(3)下图是该同学根据表中数据作的图,纵轴是砝码的质量,横轴是弹簧长度与_________的差值(填“L0或L1”)。

(4)由图可知弹簧和的劲度系数为_________N/m;通过图和表可知砝码盘的质量为_________g(结果保留两位有效数字,重力加速度取9.8m/s2)。

题型:选择题

下列对文件系统的多级目录结构的描述正确的是

A.线性结构

B.树形结构

C.散列结构

D.双链表结构

题型:选择题

胆固醇合成的主要场所是

A.肾

B.肝

C.小肠

D.脑

E.胆

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