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【单选题】
下列离子的浓度均为1.0 mol/L，其中能在1.0 mol/L NH4Cl溶液中生成氢氧化物沉淀的是（括号内数据为该离子形成氢氧化物的溶度积常数，KbNH3=1.75×10^-5）（）A.
Mn2+( 1.9× 10^-13 )
B.
Mn2+( 1.2× 10^-15 )
C.
Fe3+ (4.0× 10^-38 )
D.
Mg2+ (1.8×10^-11 )
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皮皮学刷刷变学霸
举一反三
【单选题】个月女婴,6.2kg,母乳喂养,未添加任何辅食,大便5~6 次/日,黄色糊状便,无臭味。大便细菌培养阴性。该患儿的治疗正确的是( )
A.
庆大霉素
B.
利巴韦林
C.
氨苄西林
D.
诺氟沙星
E.
添加辅食及助消化药
【单选题】How to practise "Less is More" in our life according to unit 6?
A.
We should control our desire of buying too many unnecessary things.
B.
Throw unnecessary and useless things from time to time to keep room clean and tidy.
C.
To focus our mind on our goals, instead of being distracted by too many choices.
D.
All of the above.
【单选题】The headmaster said, ' our hope that every one of the students in our school can go to college after they graduate.' [ ]
A.
This is
B.
There is
C.
That is
D.
It is
【简答题】In our college four students enjoy a bedroom . A B C D
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