单项选择题
A.常用电磁阀的正线 B.缓解电磁阀的正线 C.紧急电磁阀的正线 D.上述三个电磁阀的负线
A.3.08Ω B.2.25Ω C.1.43Ω D.20Ω
A.2.9MPa_+0.1MPa B.2.4MPa±0.16MPa C.0.19MPa±0.05MPa D.0.32MPa±0.05MPa