logo - 刷刷题
下载APP
【单选题】

制造永久磁铁的材料是( )。

A.
矩磁材料
B.
反磁材料
C.
硬磁材料
D.
软磁材料
举报
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【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】永久磁铁属于( )材料。

A.
硬磁材料
B.
软磁材料
C.
弱磁材料
D.
反磁材料