在ADSL线路安装时，入户线应使用（）线。
参考答案：双绞
The film ____ on the book by Jack London is well worth ____. [ ]
A. basing; seeing
B. based; being seen
C. basing; to be seen
D. based; seeing
变频器可以通过电容器来改善功率因数。（）
