单项选择题
A.14 B.16 C.18
A.14.0-21.0欧姆 B.15.0-23.0欧姆 C.18.0-26.0欧姆 D.19.0-29欧姆
A.10 B.11 C.12 D.13
A.CAN-B B.LIN C.CAN-C D.硬线
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