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【单选题】
下列配离子中,按还原性由弱排列,顺序正确的是( ) 1 [Co (H 2 O) 6 ] 2 + 2 [Co (NH 3 ) 6 ] 2 + 3 [Co (CN) 6 ] 4 - 4 [Fe (CN) 6 ] 4 -A.
①②③④
B.
④③②①
C.
③④②①
D.
③②④①
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A.
to wait
B.
waiting
C.
waited
D.
to waiting
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A.
（A）市级
B.
（B）县级
C.
（C）乡级
D.
（D）省级
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A.
waiting
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to wait
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wait
D.
waited
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