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【单选题】
水中同时含有铁(Fe2+)、锰(Mn2+)时，多采用曝气充氧后进入催化滤池过滤。在一般情况下，( )。A.
Fe2+穿透滤层
B.
Mn2+穿透滤层
C.
Fe2+、Mn2+同时穿透滤层
D.
MnO2穿透滤层
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举一反三
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A.
have to
B.
must
C.
be able to
D.
will have to
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A.
She's unable to attend the study session.
B.
She has seen a doctor recently.
C.
She's concerned about medical care.
D.
She mentions the need for some medical tests.
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A.
n. → v. B. v. → adj. C. v. → n.
B.
v. → adj.
C.
v. → n.
D.
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