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【简答题】
简述永久性磁铁、非永久性磁铁?
题目标签:
磁铁
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参考解析:
刷刷题刷刷变学霸
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【简答题】磁铁为什么能吸铁而不能吸铜、铝等金属?
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【单选题】Questions 57 to 61 are based on the following passage. Within fifteen years Britain and other nations should be well on with the building of huge industrial architectures for the recycling of waste. T...
A.
attempts to find efficient ways of recycling wastes
B.
efforts to protect the environment in British cities
C.
a good way to locate plants for waste recycling
D.
a cheap way to get energy from waste materials
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【单选题】Questions 57 to 61 are based on the following passage. Within fifteen years Britain and other nations should be well on with the building of huge industrial architectures for the recycling of waste. T...
A.
The issue of rubbish-dealing can not be completely solved.
B.
Recycling plants will be in great need in rural areas.
C.
The plants can process a wide variety of materials.
D.
Effective ways of sorting out rubbish have long been in existence.
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【简答题】简述永久性磁铁、非永久性磁铁?
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【单选题】永久磁铁的磁通是()。
A.
随时间变化的
B.
不随时间变化的
C.
随温度变化的
D.
随环境变化
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【简答题】有一额定电压为220V的直流电磁铁,若把它接在220V的交流电源上,会发生什么现象?
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【单选题】纯磁铁的分子式是()。
A.
Fe
2
O
3
B.
FeO
C.
Fe
3
O
4
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【单选题】名词翻译:磁铁
A.
calendar
B.
magnet
C.
landmark
D.
fat
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【单选题】Within fifteen years Britain and other nations should be well on with the building of huge industrial architectures for the recycling of waste. The word rubbish could lose its meaning because everythi...
A.
to get prepared to do
B.
to get along well with
C.
to try to complete
D.
to be very good at
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【判断题】地球是一块磁铁。
A.
正确
B.
错误
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