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生命的源泉，也是不可缺少的资源． （1）下列物质中属于纯净物的是（填字母）______． A．汽水B．蒸馏水C．矿泉水D．水蒸汽 （2）除去水中杂质有多种方法．若要除去热水瓶中的水垢，可以选用的试剂是______．上图1为活性炭净水器示意图．活性炭的作用是______． （3）自来水厂净水过程中需加消毒剂．二氧化氯（ClO 2 ）是新一代饮用水的消毒剂，其中氯元素的化合价为______．二氧化氯是由______元素（填元素符号）组成．一个二氧化氯分子是由______个原子构成． （4）有关电解水实验（如上图2）的叙述中，不正确的是______（填字母）． A．试管甲中的气体可以燃烧 B．该实验证明由氢元素和氧元素组成 C．正极与负极产生的气体的质量比是1：8 D．正极与负极产生的气体的体积比是1：2．
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参考答案：
举一反三
【单选题】急性肺水肿时可出现
A.
喉部痰鸣音
B.
双肺底湿啰音
C.
局限性哮鸣音
D.
局限性小水泡音
E.
两肺满布湿啰音
查看完整题目与答案
【单选题】What was the overall rise in expenditure on household goods and services overthe ten years?
A.
about £20
B.
about £13
C.
about £10
D.
0
查看完整题目与答案
【判断题】水准尺应是笔直，没有弯曲变形。
A.
正确
B.
错误
查看完整题目与答案
【单选题】若有定义: char *ps[ ]={"aa","bb","cc","dd"}; ,则以下叙述正确的是 ______ 。
A.
ps[0] 是字符串 "aa" 的首地址
B.
*ps[0] 是字符串 "aa" 的首地址
C.
ps[0] 是字符串 "aa"
D.
*ps[0] 是字符串 "aa"
查看完整题目与答案
【单选题】根据下列文章，回答26～30题。 For the past several years， the Sunday newspaper supplement Parade has featured a column called “Ask Marilyn.” People are invited to query Marilyn vos Savant， who at age 10 had tested...
A.
Answering philosophical questions.
B.
Folding or cutting paper into different shapes.
C.
Telling the differences between certain concepts.
D.
Choosing words or graphs similar to the given ones.
查看完整题目与答案
【单选题】根据下列文章,请回答 36～40 题。 New Foods and the New World In the last 500 years, nothing about people -- not their clothes, ideas, or languages-- has changed as much as what they eat. The original chocolate dri...
A.
Food.
B.
Clothing.
C.
Ideology.
D.
Language.
查看完整题目与答案
【单选题】根据下列文章,请回答 41～45 题。 New Foods and the New World In the last 500 years, nothing about people -- not their clothes, ideas, or languages－－ has changed as much as what they eat, The original chocolate dri...
A.
Food.
B.
Clothing.
C.
Ideology.
D.
Language.
查看完整题目与答案
【单选题】第 27 题(本题:1分) 若有定义:char *ps[]={"aa","bb","cc","dd"};,则以下叙述正确的是
A.
ps[0]是字符串"aa"
B.
*ps[0]是字符串"aa"的首地址
C.
ps[0]是字符串"aa"的首地址
D.
*ps[0]是字符串"aa"
查看完整题目与答案
【单选题】下面 的方法中, ( ) 方法不能实现淡入或淡出的动画效果 。
A.
fadeIn()
B.
fadeOut()
C.
fadeTo()
D.
fadeOn()
查看完整题目与答案
【判断题】港口高压设备可采用敞开型组合电器或开关柜。( )
A.
正确
B.
错误
查看完整题目与答案
相关题目：
【单选题】急性肺水肿时可出现
A.
喉部痰鸣音
B.
双肺底湿啰音
C.
局限性哮鸣音
D.
局限性小水泡音
E.
两肺满布湿啰音
查看完整题目与答案
【单选题】What was the overall rise in expenditure on household goods and services overthe ten years?
A.
about £20
B.
about £13
C.
about £10
D.
0
查看完整题目与答案
【判断题】水准尺应是笔直，没有弯曲变形。
A.
正确
B.
错误
查看完整题目与答案
【单选题】若有定义: char *ps[ ]={"aa","bb","cc","dd"}; ,则以下叙述正确的是 ______ 。
A.
ps[0] 是字符串 "aa" 的首地址
B.
*ps[0] 是字符串 "aa" 的首地址
C.
ps[0] 是字符串 "aa"
D.
*ps[0] 是字符串 "aa"
查看完整题目与答案
【单选题】根据下列文章，回答26～30题。 For the past several years， the Sunday newspaper supplement Parade has featured a column called “Ask Marilyn.” People are invited to query Marilyn vos Savant， who at age 10 had tested...
A.
Answering philosophical questions.
B.
Folding or cutting paper into different shapes.
C.
Telling the differences between certain concepts.
D.
Choosing words or graphs similar to the given ones.
查看完整题目与答案
【单选题】根据下列文章,请回答 36～40 题。 New Foods and the New World In the last 500 years, nothing about people -- not their clothes, ideas, or languages-- has changed as much as what they eat. The original chocolate dri...
A.
Food.
B.
Clothing.
C.
Ideology.
D.
Language.
查看完整题目与答案
【单选题】根据下列文章,请回答 41～45 题。 New Foods and the New World In the last 500 years, nothing about people -- not their clothes, ideas, or languages－－ has changed as much as what they eat, The original chocolate dri...
A.
Food.
B.
Clothing.
C.
Ideology.
D.
Language.
查看完整题目与答案
【单选题】第 27 题(本题:1分) 若有定义:char *ps[]={"aa","bb","cc","dd"};,则以下叙述正确的是
A.
ps[0]是字符串"aa"
B.
*ps[0]是字符串"aa"的首地址
C.
ps[0]是字符串"aa"的首地址
D.
*ps[0]是字符串"aa"
查看完整题目与答案
【单选题】下面 的方法中, ( ) 方法不能实现淡入或淡出的动画效果 。
A.
fadeIn()
B.
fadeOut()
C.
fadeTo()
D.
fadeOn()
查看完整题目与答案
【判断题】港口高压设备可采用敞开型组合电器或开关柜。( )
A.
正确
B.
错误
查看完整题目与答案
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