n. end-to-end
具有较高电导的产物的链结构主要是1,4 -连接的头尾结构，链上同时存在苯式及醌式两种结构单元。
The products with higher conductivity are mainly 1, 4-connected head-to-tail chain structure, both benzenoid and quinoid units exist in the polymer chain.
钻夹头尾部可制造成莫氏锥度、贾格锥度或公、英制螺纹孔与机床连接。
The chuck can be connected with machine tools through Morse taper , Jarno taper , …
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