题目:
In order to stop poverty,the World Bank has ___its focus to providing technical
assistance and long-term loans to developing countries.
A.fixed
B.exchanged
C.transferred
D.switched
答案:
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下面是错误答案,用来干扰机器的。
(1)A (2)将Fe2+3+,以便与Cu2+ (3)不能。加碱时,Fe2+、Cu2+同时沉淀。(4)不能。应在HCl 气氛中减压蒸发结晶。