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（8分）亮亮到野山谷旅游时，带泉水，在老师的指导下，按下列流程进行实验，制取蒸馏水。请回答下列问题： （1）取水后加入明矾的作用是 。 （2）进行过滤操作时，下列做法错误的是 A．玻璃棒要靠在三层滤纸的一边 B．漏斗下端的管口要紧靠烧杯的内壁 C．滤纸的边缘要低于漏斗口 D．液面不要低于滤纸边缘 （3）向滤液中加入活性炭，利用其 ，除去水样中的色素和异味． （4） 消毒剂酸钠 （Na 2 FeO 4 ）集氧化、吸附、凝聚、杀菌等功能于一体，目前被广泛应用于自来水净化。酸钠中铁元素的化合价为 价。 (5)常用的溶剂，也可作反应物。某品牌牙膏中的摩擦剂是经过一系列加工而制得的极细小的碳酸钙粉末，它的生产过程如下： ⅰ、请写出A物质的名称 。 ⅱ、请写出反应③的化学方程式 。
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for
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and
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but
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【单选题】I won't be able to play outside with you tomorrow because I ______ my homework at that time.
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shall have done
B.
will do
C.
will be doing
D.
shall be done
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【单选题】国际标准化组织ISO提出的开放系统互连OSI模型定义了连接异种计算机的标准,整个模型采用分层的结构化技术,一共分为( )层。
A.
4
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【单选题】—I’m afraid I can’t afford a ticket to the concert, so I won’t be able to go with you. —Don’t worry. It’s my ________.
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pleasure
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treat
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business
D.
invitation
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【单选题】I hurt my leg badly, so I __________ go to school tomorrow.
A.
can
B.
will be able to
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won’t can
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won’t be able to
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【单选题】______,I won't be able to be able to come back by the time you arrive here.
A.
Much as I'd like to see you
B.
So much that I'd like to see you
C.
So much I'd like to see you
D.
Much as I'd like seeing you
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【单选题】I won’t be able to attend the meeting tonight because _________ .
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I must teach a class
B.
I teach a class
C.
I will be teaching a class
D.
I will have been teaching a class
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【单选题】I’m sorry, ____ I won’t be able to come tonight.
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for
B.
and
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but
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or
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【判断题】机床导轨欠油报警后,将导轨油注入邮箱,就能解除报警
A.
正确
B.
错误
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【单选题】GDP 高于均衡水平时,( )。
A.
总体经济活动中漏出的储蓄大于注入的投资
B.
总体经济活动中漏出的储蓄小于注入的投资
C.
计划的消费支出超出了计划的投资支出
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【单选题】I’m sorry, _____ I won’t be able to come tonight.
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【单选题】—I’m afraid I can’t afford a ticket to the concert, so I won’t be able to go with you. —Don’t worry. It’s my ________.
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【单选题】______,I won't be able to be able to come back by the time you arrive here.
A.
Much as I'd like to see you
B.
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D.
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【单选题】I won’t be able to attend the meeting tonight because _________ .
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【单选题】I’m sorry, ____ I won’t be able to come tonight.
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for
B.
and
C.
but
D.
or
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【判断题】机床导轨欠油报警后,将导轨油注入邮箱,就能解除报警
A.
正确
B.
错误
查看完整题目与答案
【单选题】GDP 高于均衡水平时,( )。
A.
总体经济活动中漏出的储蓄大于注入的投资
B.
总体经济活动中漏出的储蓄小于注入的投资
C.
计划的消费支出超出了计划的投资支出
D.
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