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【简答题】
欲把 Fe 2+ 氧化到 Fe 3+ ,而又不引入其它金属元素,可以采用的切实可行的氧化剂为 (1)_______________ , (2)_______________ , (3)________________ 。 ( E y (Cl 2 /Cl) = 1.36 V , E y (Br 2 /Br) = 1.08 V , E y (H 2 O 2 /H 2 O) = 1.78 V , E y (Cr 2 O 7 2 - /Cr 3+ ) = 1.33 V , E y (MnO 4 - /Mn 2+ ) = 1.49 V , E y (F 2 /F - ) = 2.87 V E y (Fe 3+ /Fe 2+ ) = 0.77 V
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举一反三
【单选题】Conceptual meaning is also known as ____meaning.
A.
denotative
B.
connotative
C.
sense
D.
lexical
【单选题】Theoretically speaking, ________ can be interpreted as a special suffixation because in its process a zero suffix is thought to be added to the word base to form new lexical meaning.
A.
inflection
B.
compounding
C.
conversion
D.
blending
【单选题】One way to analyze lexical meaning is _______.
A.
predication analysis
B.
stylistic analysis
C.
componential analysis
D.
proposition analysis
【单选题】The correct meaning of a lexical item in a given context is____ .
A.
the one provided in a dictionary
B.
the one which best fits the context
C.
the central or core meaning of the item
D.
the one which is assumed to be correct
【单选题】One way to analyze lexical meaning is ( )
A.
predication analysis
B.
stylistic analysis
C.
proposition analysis
D.
componential analysis
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