外（护）套
参考答案：
包在金属套外面的作为电缆最外层护套的非金属套。
139. Yao Ming is very famous now. However, his basketball career _____ only after many years of hard work.
A．took on
B．took off
C．took up
D．took out
不属于建设工程监理的工作性质的特点的是( )。
A．依附性B．服务性C．科学性D．公正性
