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【简答题】
碱式碳酸铜又称“铜绿”也称“铜锈”,是一种绿色粉末。它是由铜在潮湿的空气中与水、氧气和二氧化碳等物质发生复杂的化学反应生成的。它不溶于水,但却能和盐酸反应,取少量“铜绿”加入试管中,向试管中加入的稀盐酸,会看到有大量无色气泡,绿色粉末逐渐溶解,将产生的气体通入澄清石灰水,石灰水变浑浊。不仅如此,它还能在加热的条件下分解为黑色的氧化铜、二氧化碳气体。请回答: 上述描述碱式碳酸铜的物理性质的语句是:____________________________________;它的化学性质有①____________________________________;②____________________________________。
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举一反三
【单选题】下面()最好地描述了数据字典中应该包含的内容。
A.
数据库中存储的数据项的有组织描述及其含义
B.
描述应用程序使用的记录格式
C.
描述管理数据库用户的权利和安全规则
D.
在数据库中更新的数据在更新前后的信息
【单选题】—Where's Peter? —He Shanghai for three days. [     ]
A.
is going
B.
has been to
C.
has gone to
D.
has been in
【单选题】炸制法的热传递是热( )。
A.
对流
B.
辐射
C.
传导
D.
传播
【多选题】根据职业心理素养与竞争力提升中,“快乐地工作”有哪些具体表现?()
A.
投入
B.
松弛
C.
游戏
D.
平和
E.
懒散
【判断题】The speaker had not been confident about himself until he was 19.
A.
正确
B.
错误
【单选题】Three-fourths of the homework _____today.
A.
has finished
B.
has been finished
C.
have finished
D.
have been finished
【单选题】Three fourths of the homework _________ today.
A.
has done
B.
has been done
C.
have done
D.
have been done
【单选题】The bookshop since three years ago. [     ]
A.
was open
B.
has been open
C.
has been opened
D.
has opened
【简答题】数据记录管理包含的内容?
【单选题】The speaker mentions several problems the company was faced with. Which of the following is NOT one of the problems he mentions?
A.
Too much bureaucracy
B.
Lack of a clear marketing strategy.
C.
Quality control being not maintained.
D.
No new products coming on the market.
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