Look and write.

(1)

I have a                                              .

(2)

I                                              .

(3)

I                                             .

(4)

I                                           .

制作导线标记的方法有印字法、标记套管法和（）

A.数字法

B.线径区分法

C.胶带缠绕法

D.色环法