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【多选题】
可以用无机金属盐与铜反应变色进行定性检测的金属有以下哪些？A.
汞
B.
砷
C.
铋
D.
银
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反馈参考答案：
举一反三
【单选题】The research project has only been under way for three months, so it's too early to________its success. [ ]
A.
conclude
B.
evaluate
C.
indicate
D.
reveal
【简答题】P172 7.14(1)(2)
【单选题】The school has only been open for six months, so it's too early to ____ its success. [ ]
A.
think
B.
evaluate
C.
fail
D.
refuse
【单选题】The research project has only been under way for three months,so it's too early to___ its success. [ ]
A.
convey
B.
evaluate
C.
tend
D.
stress
【简答题】蓝铜矿主要含xCuCO 3 ·yCu(OH) 2 ，还含有少量Fe的化合物，工业上以蓝铜矿为原料制备Cu、CaCO 3 和CuSO 4 ．5H 2 O。具体方法步骤如下： 已知： 金属离子 Fe 3+ Fe 2+ Cu 2+ pH 氢氧化物开始沉淀 1.9 7.0 4.7 氢氧化物完全沉淀 3.2 9.0 6.7 （1）蓝铜矿的主要成分与焦炭高温条件可以生成铜、二氧化碳和水，写出该反应的化学方程式...
【单选题】—Where is Mr Smith? —He in prison for more than two months.
A.
has been
B.
has been sent
C.
has been thrown
D.
has been put
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