A.12R B.14R C.18R D.116R
A.0.07mm B.0.05mm C.0.2mm D.0.085mm
A.欧姆定律 B.基尔霍夫定律 C.焦耳-楞次定律 D.电磁感应定律
A.轴 B.蜗轮 C.齿轮 D.蜗杆
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