A.減小上接點(diǎn)片壓力B.減小下接點(diǎn)片壓力C.增大上接點(diǎn)片壓力D.增大下接點(diǎn)片壓力
A.0.7B.0.8C.1.2D.0.9
A.0.1-0.3B.0.2-0.3C.0.3D.0.2