下列关于电磁现象的说法中正确的是 [ ] A．电磁铁的磁性强弱只与线圈的匝数有关
题型：选择题
问题：
下列关于电磁现象的说法中正确的是 [ ]
A．电磁铁的磁性强弱只与线圈的匝数有关
B．扬声器与话筒都是把声信号转变为电信号的装置
C．感应电流的方向只与导体切割磁感线的方向有关
D．电动机是把电能转化为机械能的机器
题型：选择题
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小题1: What is Captain Cash?
A．A bookstore
B．An online shop
C．An expert
D．A website小题2: What’s the RRP of 40 DVD box set of The Friend?
A．£39.99
B．£99.99
C．£59.99
D．£109.99小题3: Which of the following is NOT TRUE concerning Captain’s saving tips?
A．Paying utility bills in cash is a more economical way.
B．Paying the full price when buying a home insurance is a wise choice.
C．Accurate estimate of your yearly mileage is key to a car insurance.
D．Power off the electrical appliances while they are not being used.