光缆线路中设置（）以增大传输距离。
参考答案：光中继器
As we all know, the generation ____ makes it difficult for parents to understand their children's opinions. [ ]
A. division
B. gap
C. separation
D. interval
尺寸起止符号一般应用（）绘制，其倾斜方向应与尺寸界线成顺时针45º角。
A.点划短线
B.中粗斜短线
C.粗斜虚线
D.细虚短线
