脉冲编码调制是一种将()变换成()的方式。
参考答案:模拟信号,数字信号
It’s important ____ the piano well.
A.of him to play
B.for him to play
C.of him playing
D.for him playing
治疗风热,肝热之目赤肿痛的首选药组是()
A.菊花、麻黄
B.薄荷、柴胡
C.桑叶、菊花
D.蝉蜕、牛蒡子
E.蝉蜕、柴胡