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【单选题】
三种常见的氧化物：FeO、Fe 2 O 3 、Fe 3 O 4 。现有某铁的氧 化物样品，已知其中铁元素与氧元素的质量比是21:8，关于该样品的说法正确的是 [ ]A.
一定是Fe 3 O 4
B.
若是由两种物质组成，则无法求出这两种物质的质量比
C.
可能是FeO、Fe 2 O 3 组成的混合物
D.
该样品组成有两种情况
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举一反三
【单选题】2 “While the increase in carbon dioxide in the atmosphere is the main effect of global warming, there are other effects as well. For example, there is a marked increase in infectious diseases that hav...
A.
First-person narrator
B.
Second-person narrator
C.
Third-person narrator
D.
None of the above
【多选题】饭店应采取人事部门培训与业务部门培训相结合、集中培训与岗上“传帮带”相结合的培训方法,原因是饭店员工( )。
A.
工作时间长
B.
流动频繁
C.
文化素质低
D.
礼仪习惯差
【单选题】“While the increase in carbon dioxide in the atmosphere is the main effect of global warming, there are other effects as well. For example, there is a marked increase in infectious diseases that have ...
A.
First-person
B.
Second-person
C.
Third-person
D.
None of the other three
【单选题】“ While the increase in carbon dioxide in the atmosphere is the main effect of global warming, there are other effects as well. For example, there is a marked increase in infectious diseases that have...
A.
First-person narrator
B.
Second-person narrator
C.
Third-personal narrator
D.
None of the above
【单选题】Most of the main ideas below come from college textbooks. In the space provided, write the letter of the pattern of organization that each suggests. A communicable disease is one in which an infectiou...
A.
Definition and example
B.
Comparison and/or contrast
C.
Cause and effect
【单选题】“While the increase in carbon dioxide in the atmosphere is the main effect of globalwarming, there are other effects as well. For example, there is a markedincrease in infectious diseases that have ch...
A.
First-person narrator
B.
Second-person narrator
C.
Third-personal narrator
D.
None of the above
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