在电子束产生过程中，屏蔽半径应尽可能地小，且击穿延时时间较短，故选择石墨作为阴极材料。
Because of its small screening radius and short delay time, graphite is chosen as the cathode material.
通过对高压器件的防击穿保护，并增加适当的延时电路，大幅度提高了驱动电路的工作稳定性。
The circuit 's working stability is improved greatly through anti-breakdown protection and adding appropriate time-delay circuit.
通过对高压器件的防击穿保护，并增加适当的延时电路，大幅度提高了驱动电路的工作稳定性。
The circuit 's working stability is improved greatly through anti-breakdown protection and adding appropriate time-delay circuit.
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