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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 fif 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】电磁铁的铁芯（ ）
A.
采用钢棒，因为钢棒比铁棒硬
B.
采用铁棒，因为铁棒的磁性不能保留下来
C.
采用铁棒，因为铁棒价格较低
D.
采用钢棒，因为钢棒的磁性能够保留下来
【单选题】Questions 57 to 61 are based on the following passage. Within fif 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.
【单选题】Within fif 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
相关题目：
【单选题】Questions 57 to 61 are based on the following passage. Within fif 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】下列物体中磁铁不吸引的是（）
A.
一角硬币
B.
一元硬币
C.
铁钉
【单选题】电磁铁的铁芯（ ）
A.
采用钢棒，因为钢棒比铁棒硬
B.
采用铁棒，因为铁棒的磁性不能保留下来
C.
采用铁棒，因为铁棒价格较低
D.
采用钢棒，因为钢棒的磁性能够保留下来
【单选题】Questions 57 to 61 are based on the following passage. Within fif 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.
【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
【判断题】永磁起动机的磁极是永久磁铁。
A.
正确
B.
错误
【判断题】通用设备常用低压控制电器有接触器、继电器、主令电器、控制器和电磁铁等。
A.
正确
B.
错误
【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
【多选题】磁铁的性质具有（）性质。
A.
磁铁会吸引铁等金属
B.
磁铁有两个磁极
C.
磁铁能指示南北方向
D.
磁铁同极相互排斥
E.
磁铁异极相互吸引
【单选题】纯磁铁的分子式是（）。
A.
Fe2O3
B.
FeO
C.
Fe3O4
【判断题】速度继电器的定子是一块永久磁铁
A.
正确
B.
错误
【单选题】名词翻译:磁铁
A.
calendar
B.
magnet
C.
landmark
D.
fat
【单选题】Within fif 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
【单选题】电磁铁属于（）。
A.
控制电器
B.
主令电器
C.
保护电器
D.
执行电器
【判断题】地球是一块磁铁。
A.
正确
B.
错误
【单选题】适合于制作永久磁铁的材料是( )
A.
顺磁性材料
B.
抗磁性材料
C.
软磁性材料
D.
硬磁性材料
【判断题】存在于载流回路或永久磁铁周围空间，能对运动电荷施力的特殊物质称为磁场。
A.
正确
B.
错误