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【单选题】
不能用下列的哪一种手段制造酮？（）
A.
仲醇的氧化作用
B.
仲醇的脱氢作用
C.
在300℃时加热可挥发性酸（含有MnO2）
D.
氰化物的水解
E.
酸性氯化物与有机镉化物的反应
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【单选题】不能用下列的哪一种手段制造酮？（）
A.
仲醇的氧化作用
B.
仲醇的脱氢作用
C.
在300℃时加热可挥发性酸（含有MnO2）
D.
氰化物的水解
E.
酸性氯化物与有机镉化物的反应
【单选题】In nearly every town or city centre in the UK, on most days of the week you can find one or more people standing in the street selling a magazine _____（21） The Big Issue. These people are all _____（22...
A.
driving
B.
living
C.
drawing
D.
working
【单选题】Science seems to be getting closer to answering a very old mystery (奥秘)．Homing pigeons (信鸽) can be taken hundreds of miles from their homes．When they are let to go to fly again, they find their way ho...
A.
they have a built-in compass
B.
they can cover 500 miles in a single day
C.
they have special ability to tell directions
D.
they can find their way home
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【单选题】不能用下列的哪一种手段制造酮？（）
A.
仲醇的氧化作用
B.
仲醇的脱氢作用
C.
在300℃时加热可挥发性酸（含有MnO2）
D.
氰化物的水解
E.
酸性氯化物与有机镉化物的反应
【单选题】In nearly every town or city centre in the UK, on most days of the week you can find one or more people standing in the street selling a magazine _____（21） The Big Issue. These people are all _____（22...
A.
driving
B.
living
C.
drawing
D.
working
【单选题】Science seems to be getting closer to answering a very old mystery (奥秘)．Homing pigeons (信鸽) can be taken hundreds of miles from their homes．When they are let to go to fly again, they find their way ho...
A.
they have a built-in compass
B.
they can cover 500 miles in a single day
C.
they have special ability to tell directions
D.
they can find their way home
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