第四级属于高级程度，使操控者有能力执行基础的倒飞动作。
To the level of a pilot capable of performing the beyond the basics of Inverted Flight.
倒相器将延迟级中的最后一级的级输出连接至该延迟级中第一级的级输入。
The inverter connects a stage output of a last one of the delay stages to a stage input of a first one of the delay stages.
电路(100)包括：倒相级(120)，连接在第一导体(101)与第二导体(102)之间。
The circuit (100) comprises an inverter stage (120), connected in between the first conductor (101) and the second conductor (102).
该计数器包括倒相器和具有可选择级延迟的级联延迟级。
The counter includes an inverter and cascading delay stages having selectable stage delays.
该计数器包括倒相器和具有可选择级延迟的级联延迟级。
The counter includes an inverter and cascading delay stages having selectable stage delays.
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