数字语音电话系统有()。
A.模拟中继
B.载波中继
C.网络中继
D.数字中继
参考答案:B
— By the way, _____ is your father?
— He's quite well, thank you. [ ]
A. who
B. what
C. how old
D. how
“有意味的形式”说的合理之处在于突出了艺术的()本质方面。
A.审美
B.功利
C.社会
D.自然