A.7cm B.8cm C.9cm D.10cm
A.導(dǎo)電 B.絕緣 C.耐高壓 D.耐大電流
A.角桿撐桿平分轉(zhuǎn)彎 B.角桿線條平分轉(zhuǎn)彎 C.撐桿線條平分轉(zhuǎn)彎 D.電桿線條平分轉(zhuǎn)彎