Coupled with circuit equations, the opening time of movable contact also can be calculated using iteration with the restriction of contact force.

通过耦合电路方程，并以动触头上的预压力为约束，经迭代运算，确定动触头的打开时间。

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Shunt trip Shunt trip is a feature added to a circuit breaker or fusible switch to permit the remote opening of the breaker or switch by an electrical signal.

分励脱扣分励脱扣是线路断路器或可熔电闸的一个特性，可通过远程信号来进行分断或转换。

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However, the need for oil flow in hydraulic circuit reverse flows can use hydraulic control, opening a one-way valve, so that the flow of oil can flow in both directions.

但在液压回路中需要油流反向流动时又可利用控制油压，打开单向阀，使油流在两个方向都可流动。

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Toseland, who enjoyed his best performance of last season at this circuit, was among the pacesetters over the opening laps and ended up seventh fastest despite his misdemeanour - merely a result of pushing the front end too hard as he chased an improved lap time.

BBC: Matt Roberts' MotoGP column

Its sudden elevation in status over Chester-le-Street and Trent Bridge, in particular, remains the subject of much rancour on the circuit and we all hope that the venue proves its worth as host of the opening Test of this much anticipated series.

BBC: Jonathan Agnew column