单项选择题


则
A、正确
B、错误

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问答题
The predicate(谓语) of the following sentence “In order to catch up with and even surpass developed countries in science and technology as soon as possible, China has sharply increased research and development funds” is ______________ A、 catch up with B、 surpass C、has increased D、 funds
单项选择题
如图所示，若，则方框中应接入的元件为？
A．RL串联
B．电容
C．电感
D．电阻
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