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下面是同学对未知气体M的研究论文摘要，请仔细阅读后回答问题． M在通常状态下是一种无色有刺激性气味的气体，密度比空气小，置于空气中不变质，极易溶于水，在实验室由A和B的固体混合物加热制得．该物质在催化剂A的作用和加热的条件下与O 2 反应，生成氮的一种氧化物和水． （1）实验室制取M气体的发生装置应与实验室制______的发生装置相同：其收集方法应采用______． （2）M中肯定含有的元素是______；不能确定是否含有的元素是______．
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【单选题】One of the reasons why VCRs are so difficult to use is that ________.
A.
the designers are often insensitive to the operational complexities of their machines
B.
the range of features provided is unlimited
C.
there is no ideal way of controlling quality
D.
their designers often ignore the complaints of their users
【单选题】Specialization is encouraged because______.
A.
people can use their money to buy whatever they want
B.
people do not need to make a complete product for exchange
C.
people make a great contribution to the manufacture of a product
D.
people can not use their money to buy whatever they want
【简答题】通过制作设计,认知 Excel 操作界面,熟悉文件夹、工作簿、工作表的创建。 1.1 启动 Excel ,新建工作簿文件并保存,文件名为“员工通讯录 .xls ”;( 5 分) 1.2 在“员工通讯录 .xls ”的 Sheet1 工作表中,从 A2 单元格起,建立如附件所示的工作表。( 70 分) 1.3 将“员工通讯录 .xls ”的 Sheet1 设为工作表保护。( 5 分) 1.4 在“员...
【简答题】在 D 盘新建一个 Excel 工作簿文件并保存为“学号 + 姓名”。扩展名为
【单选题】Specialization is encouraged because people______.
A.
can use their money to buy whatever they want
B.
do not need to make a complete product for exchange
C.
can share their products with many others
D.
cannot use their money to buy whatever they want
【多选题】合同法定解除的一般事由有( )(P148)
A.
履行期限届满之前，当事人一方明确表示或者以自己的行为表明不履行主要义务
B.
当事人在合同中约定的解除条件，该条件成就
C.
当事人一方迟延履行主要义务。催告后在合理期限内仍未履行
D.
当事人方迟延履行主要义务，或者有其他违约行为致使不能实现合同主要目的
E.
当事人在合同中约定失效期限，该期限届满时
【单选题】The _____ specification delineates specific end use capabilities which can be tested in the acceptance procedure.
A.
performance
B.
functional
C.
technical
D.
base line
E.
operational
【单选题】— Can I use the telephone on the table, sir? 一 Under no circumstances ____to use the telephone in the office for personal affairs.
A.
anyone is allowed
B.
nobody is allowed
C.
is anyone allowed
D.
is nobody allowed
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