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【单选题】

永久磁铁是由()制成

A.
软磁材料
B.
硬磁材料
C.
矩磁材料
D.
非铁磁材料
题目标签:永久磁铁磁铁
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参考解析:
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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

【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

【单选题】永久磁铁属于( )材料。

A.
硬磁材料
B.
软磁材料
C.
弱磁材料
D.
反磁材料

【单选题】名词翻译:磁铁

A.
calendar
B.
magnet
C.
landmark
D.
fat