如果总时间差值小于 maxTimeDiff（500 毫秒），则 totalTimeOK 子例程认为密码及其确认有效。

The totalTimeOK subroutine considers a password and its confirmation valid if their total time discrepancy is less than maxTimeDiff (500 milliseconds).

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无换向架链条抽油机的链条承受的总拉力为悬点载荷与平衡重的差值加连杆对链条的水平分力在链条上形成的附加拉力之和，受力状况优于普通链条抽油机，且能得到控制。

The force conditions of the chain on a chain drive pumping unit without reverse rack are much more favorable than that on conventional chain drive pumping units, and can be well controlled.

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总垂直误差(TVE)：航空器实际飞行的气压高度和指定的气压高度(飞行高度层)之间的垂直几何差值。

Total Vertical Error (TVE) : Vertical geometric difference between barometric altitude in actual flight of aircraft and designated barometric altitude (flight level).

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