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【简答题】
• L ’é glise est ...... .. (ancien)
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皮皮学刷刷变学霸
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【简答题】氯化铵、硫酸钾是常见的化肥,请回答下列问题: ( 1)氯化铵的化学式______; ( 2)铵根离子______(填写离子符号),其氮元素化合价为______; ( 3)铵态氮肥不能与碱性肥料混合施用。氯化铵与氢氧化钠溶液共热反应的化学方程式为___ _ 。碳酸氢铵应避免在气温较高时使用,其受热分解的化学方程式为 _______ _。碳酸氢铵还能与盐酸反应,其化学方程式为________ ; ( ...
【单选题】mso-hansi-font-family:"Times New Roman"">氯化铵的化学式为
A.
Na2CO3
B.
NH3Cl
C.
NH4Cl
D.
NH4NO3
【简答题】(10分)为提高氯化铵的经济价值,我国化学家设计了利用氢氧化镁热分解氯化铵制氨气并得到碱式氯化镁(MgOHCl)的工艺。某同学根据该原理设计的实验装置如图: 请回答下列问题: (1) 装置A中发生反应生成碱式氯化镁的化学方程式为_____________;装置B中碱石灰的作用是_______。 (2) 反应过程中持续通入N 2 的作用有两点:一是使反应产生的氨气完全导出并被稀硫酸充分吸收,二是__...
【单选题】-What’s the matter? -Just in front of the bus an injured man, all covered with blood.
A.
where lies
B.
does lie
C.
lies
D.
lying is
【简答题】[WJ-400-500]主机和路由器中都有路由表,但主机只会根据本身的路由表去访问目标,而路由器会根据本身的路由表进行(__)
【单选题】Which of the following is NOT included in the front matter of a report?
A.
Letter of transmittal
B.
Abstract
C.
Glossary
D.
Table of contents
【单选题】Lily, don’t stand _______ the bus, because it _______ soon.
A.
in front of ; will start
B.
in the front of; is going to start
C.
in front of ; start
D.
in the front of; starts
【单选题】There is a wooden bridge ______the river _______ my house.
A.
above, in front of
B.
over, in the front of
C.
above, in the front of
D.
over, in front of
【单选题】Two cars crashed in each other heavily in front of my car. I escaped death ______ a matter of inches.
A.
as
B.
at
C.
to
D.
by
【简答题】NER (nucleotide excision repair)
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