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【简答题】
金属在日常生活中随处可见,铁、铜、铝、锌都是常见金属. (1)下列用品中,主要应用金属导热性的是______(填序号). (2)辩证的研究金属锈蚀问题可以帮助我们更好地利用金属,右图“取暖片”的发热过程就是利用铁生锈的原理.铁生锈的条件是______,防止自行车生锈的措施有______(写出一种即可). (3)为了回收金属资源,从锁具加工厂的废旧黄铜粉末中(含有、锌),分离和提取出和ZnSO 4 溶液,其实验过程如下: 请回答: (Ⅰ)A是______. (Ⅱ)步骤②的化学反应方程式为______,其目的是______. (Ⅲ)为达到实验目的,整个实验过程可以简化为______.
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举一反三
【单选题】Air pollution and the degradation of the environment can be regarded as:
A.
An inefficient production outcome
B.
A social cost
C.
A misallocation of resources
D.
An economic loss
【简答题】CD-R光盘刻录机主要有四种刻录方式:______ 、轨道刻写、多段、增量式分组刻写。
【多选题】CD—R刻录机的速度指标有( )
A.
刻录速度
B.
擦写速度
C.
读取速度
D.
转速
【单选题】The real goal in security now is to retard the degradation of the halfl ives of secrets. Secrets are like isotopes.
A.
reduction of energy to a less readily convertible form
B.
wearing down and disintegrating of rock
C.
lowering the quality of something
【判断题】可用多用电表欧姆档直接测量表头内阻
A.
正确
B.
错误
【多选题】Which are formulation factors affecting the degradation of pharmaceutical preparations?
A.
pH
B.
Solvent
C.
Temperature
D.
Ionic strength
E.
Light
【单选题】The degradation of amino acids can be classified into families, which are named after the end product of the degradative pathway. Which one of the following is such an end product?
A.
Citrate
B.
Glyceraldehyde 3-phosphate
C.
Fructose 6-phosphate
D.
Malate
E.
Succinyl-CoA
【简答题】视频监控系统一般设置有:摄像机、()、录像机(或硬盘刻录机)、矩阵主机和画面处理器等。
【简答题】视频监控系统一般设置有:_____、_____、录像机(或硬盘刻录机)、矩阵主机和画面处理器等。
【单选题】The use of big data can help scientists __________ not only the degradation of the environment but can be part of the solution to achieve sustainability, according to a new commentary paper.
A.
dock
B.
chart
C.
participate
D.
range
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