ISUP部分是七号信令系统的第()级。
参考答案:4
L1信号属于()。
A.载波信号
B.伪随机噪声码
C.随机噪声码
D.捕获码
The_______ you are in the exam, the_______ mistakes you will make.
A.carefully, few
B.more careful, fewer
C.more carefully, fewer
D.more careful, less