判断题

数字基带处理电路输出的功率控制信号要进行数模转换，经滤波后，送至功率放大电路，实现功率等级的控制。

答案：正确

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单项选择题

If you are a woman with type 1 diabetes and your child was born before you were 25, your child’s risk is _______.

A．1 in 4
B．1 in 17
C．1 in 25
D．1 in 100

指出该句中的表语: Why is he worried about Jim? 、

答案： (1)
worried