A/D转换是把采集的模拟量转换成（）
A.十进制的数字量
B.二进制的数字量
C.八进制的数字量
参考答案：B
They had kept working for several weeks everything was in order.
A．before
B．after
C．since
D．unless
B．峰值220V，频率0.02Hz
C．有效值220V，频率50Hz
D．峰值220V，频率50Hz
