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【单选题】
电磁继电器和舌黄管的磁铁分别是 （）
A.
拍合式和吸入式电磁铁
B.
拍合式和旋转式电磁铁或永久磁铁
C.
吸入式和旋转式电磁铁或永久磁铁
D.
前者是电磁铁，后者是电磁铁或永久磁铁
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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