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【單選題】
把ag鐵鋁合金粉末溶于足量鹽酸中，加入過量NaOH溶液。過濾出沉淀，經洗滌、干燥、灼燒，得到紅棕色粉末的質量仍為ag，則原合金中鐵的質量分數為
A.
70%
B.
52.4%
C.
47.6%
D.
30%
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舉報參考答案：
舉一反三
【單選題】Which is NOT allowed in the wards?
A.
Having soft drinks.
B.
Visiting patients in the morning.
C.
Smoking in certain areas.
【單選題】What program will follow this radio talk?
A.
A music program.
B.
A medical report.
C.
Hospital rules.
【單選題】It rained heavily in the south, ______ serious flooding in several provinces.
A.
caused
B.
having caused
C.
causing
D.
to cause
【單選題】Everyone knows that ______ paper was invented by _______ Chinese.
A.
/; the
B.
the; a
C.
a; /
D.
a; a
相關題目：
【單選題】Which is NOT allowed in the wards?
A.
Having soft drinks.
B.
Visiting patients in the morning.
C.
Smoking in certain areas.
【單選題】What program will follow this radio talk?
A.
A music program.
B.
A medical report.
C.
Hospital rules.
【單選題】It rained heavily in the south, ______ serious flooding in several provinces.
A.
caused
B.
having caused
C.
causing
D.
to cause
【單選題】Everyone knows that ______ paper was invented by _______ Chinese.
A.
/; the
B.
the; a
C.
a; /
D.
a; a
參考解析：
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