数字探伤仪超声信号经接收部分放大后，由模数转换器将模拟信号变为数字信号传给电。
参考答案：对
--- What is the weather like tomorrow?
--- The weather forecast says a big snowstorm is .
A．hoped
B．supposed
C．expected
D．announce
什么是基于裸机的软件设计？其设计步骤分为那几步？
