因QAM已调波是用载波的相位和幅度来表征多进制码元信息的,所以说QAM方式的载波是既调()又调()。
参考答案:幅;相
. His _____of the aeroplane was correct in every detail and could really fly.
A.shape
B.pattern
C.design
D.model
通常所说的平行比较法是指岗位评价方法中的()
A.简单排列法
B.分类法
C.选择排列法
D.成对比较法(配对比较法、两两比较法)