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先开后关; 先开后合接点; 断-合 | |||
先断后合接点 | |||
先开后合 | |||
先断后通 | |||
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先断后合; 先开后合 |
break before-make : 36 phrases in 12 subjects |
Automobiles | 1 |
Aviation | 3 |
Electricity | 1 |
Electronics | 6 |
General | 2 |
Geophysics | 1 |
Metallurgy | 2 |
Oil / petroleum | 2 |
Power system protection | 2 |
Space | 4 |
Technology | 10 |
Telecommunications | 2 |