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【多选题】
永久磁铁的优点是( )。
A.
不用电源
B.
适用于在易燃易爆场所检验
C.
磁场强度大小可任意调节
D.
容易从工件上取下来
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