振幅式M型定向中的调制系数（）。
A.与信号振幅有关
B.与电波入射角有关
C.与电波强弱有关
D.是常数，与其它参数无关
参考答案：B
__________ makes the school famous is __________ more than 90% of the students have been admitted to universities.
A．What; because
B．That;because
C．That; what
D．What;that
质量检验时，符合按检验目的是（）
A、集中检验
B、现场检验
C、巡回检验
D、验证检验
