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【简答题】
金属材料在生产生活中应用广泛。 （1）下列用品使用金属材料的是 （填字母序号）。 （2）自然界中的金属大多以化合物形式存在，获取金属单质的方法有多种。工业上用赤铁矿石冶炼铁的化学方程式为 ，这种冶炼方法叫还原法。铝的冶炼多采用电解法，通电分解熔融的氧化铝制取铝的化学方程式为 。 （3）珍惜和保护金属资源的措施之一是防止金属锈蚀，使用过的菜刀清洗后需要及时擦干放置，可以减少________对铁锈蚀的影响。 （4）回收废旧金属是保护金属资源的重要措施。化学小组的同学从电子垃圾中获得了含Cu 70%、Al 25%、Fe 4%及少量Au、Pt的电子废料，进行如下回收处理（省略分离操作和部分产品，流程以外的其他产品不含有上述元素）。回答有关问题： ①步骤c在加入固体G前除去溶液中的过氧化氢，除去过氧化氢的简单方法用化学方程式表示为 。 ②滤液A中含有的溶质是 。 ③A~J九种物质中，含有铁元素的是 （填字母序号）。
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【简答题】Watch the video and fill the following blanks with the missing sentence. 霸王龙的忧伤.mp4 I 1 . 2 . You should feel alive. You think 3 , then one day, boo, 4 , two days. The once King-rex. Well, 5 I lost th...
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【简答题】He ( ) with them to give him more time to pay last week. 2. When she was sewing, she ( ) her finger and made it bleed. 3. She had a wig on, but we soon ( ) her disguise. 4. Good friends ( ) you i...
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【判断题】资产=负债+所有者权益体现了企业资金运动过程中某一时期资产的分布和权益的构成
A.
正确
B.
错误
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【单选题】在 Word 软件中，下列不能建立一个新文档的操作是（ ）
A.
打开“文件”选项卡，选择“新建”
B.
按快捷键“Ctrl+N”
C.
在桌面空白处单击右键，选择“新建”→“Word 文档”
D.
在菜单中选择“新建”→“打开”
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【简答题】霸王龙的忧伤.mp4 Watch the video and fill the following blanks with the missing sentence. I 1 . 2 . You should feel alive. You think 3 , then one day, boo, 4 , two days. The once King-rex. Well, 5 I lost th...
查看完整题目与答案
【简答题】Watch the video and fill the following blanks with the missing sentence. 霸王龙的忧伤.mp4 I 1 . 2 . You should feel alive. You think 3 , then one day, boo, 4 , two days. The once King-rex. Well, 5 I lost th...
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【单选题】将双绞线制成交叉线,该双绞线连接的两个设备可为
A.
主机和主机
B.
主机和交换机
C.
主机和集线器
D.
主机和路由器
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【简答题】句 子翻译 1. If we are right in regarding as a daydream the story made by him, there is no further need to apologize for rejecting it. 2. Her tired body told her that it was ready to sleep. 3. His additio...
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【简答题】Direction: Change these passive voice sentences into direct expressions in the active voice. 1. The property evaluation was performed by the municipal authority. 2. A gain of 25 percent was reported f...
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【单选题】测土壤速效钾时,土样在 100ml 三角瓶中振荡 30min 后,用滤纸过滤,过滤时振荡土样的三角瓶 用蒸馏水冲洗并全部过滤。
A.
需要
B.
不需要
C.
无所谓
D.
其它
查看完整题目与答案
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【简答题】Watch the video and fill the following blanks with the missing sentence. 霸王龙的忧伤.mp4 I 1 . 2 . You should feel alive. You think 3 , then one day, boo, 4 , two days. The once King-rex. Well, 5 I lost th...
查看完整题目与答案
【简答题】He ( ) with them to give him more time to pay last week. 2. When she was sewing, she ( ) her finger and made it bleed. 3. She had a wig on, but we soon ( ) her disguise. 4. Good friends ( ) you i...
查看完整题目与答案
【判断题】资产=负债+所有者权益体现了企业资金运动过程中某一时期资产的分布和权益的构成
A.
正确
B.
错误
查看完整题目与答案
【单选题】在 Word 软件中，下列不能建立一个新文档的操作是（ ）
A.
打开“文件”选项卡，选择“新建”
B.
按快捷键“Ctrl+N”
C.
在桌面空白处单击右键，选择“新建”→“Word 文档”
D.
在菜单中选择“新建”→“打开”
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【简答题】霸王龙的忧伤.mp4 Watch the video and fill the following blanks with the missing sentence. I 1 . 2 . You should feel alive. You think 3 , then one day, boo, 4 , two days. The once King-rex. Well, 5 I lost th...
查看完整题目与答案
【简答题】Watch the video and fill the following blanks with the missing sentence. 霸王龙的忧伤.mp4 I 1 . 2 . You should feel alive. You think 3 , then one day, boo, 4 , two days. The once King-rex. Well, 5 I lost th...
查看完整题目与答案
【单选题】将双绞线制成交叉线,该双绞线连接的两个设备可为
A.
主机和主机
B.
主机和交换机
C.
主机和集线器
D.
主机和路由器
查看完整题目与答案
【简答题】句 子翻译 1. If we are right in regarding as a daydream the story made by him, there is no further need to apologize for rejecting it. 2. Her tired body told her that it was ready to sleep. 3. His additio...
查看完整题目与答案
【简答题】Direction: Change these passive voice sentences into direct expressions in the active voice. 1. The property evaluation was performed by the municipal authority. 2. A gain of 25 percent was reported f...
查看完整题目与答案
【单选题】测土壤速效钾时,土样在 100ml 三角瓶中振荡 30min 后,用滤纸过滤,过滤时振荡土样的三角瓶 用蒸馏水冲洗并全部过滤。
A.
需要
B.
不需要
C.
无所谓
D.
其它
查看完整题目与答案
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