调制信号的幅度越高，调频波的频率就越大，波形越密。（）
A. 对
B. 错
在调频时，调制信号的幅度达到最大值时，载波瞬时频率也达到最大值，瞬时相位也达到最大值。（ ）
A. 对
B. 错
It is a very popular play, and it would be wise to seats in advance.
A. have
B. buy
C. reserve
D. take
Where unemployment and crime rates are high, it can be assumed that the is due to the former.
A. later
B. latter
C. letter
D. lately
微信支付 
支付宝支付