【17】 表示由主机送往打印机的选通信号。
参考答案：STB
解析： 表示由主机送往打印机的选通信号是STB。
In my opinion, the idea of a family is much narrower than ________.
A．that used to be
B．it used to
C．it was used to
D．it used to be
法学
