当多数常规机载雷达依靠机械扫描天线收发信号的时候，有源电子扫描阵列(AESA)传感器却使用固定的孔径。
While most conventional airborne radars rely on some form of mechanically scanned antenna to transmit and receive signals, active electronically scanned array (AESA) sensors employ a fixed aperture.
减小聚焦极孔径对大发散角的电子有影响，但对聚焦作用的影响不如改变电位明显。
Reduction of the focus hole diameter strongly affects the electrons with large emission angle but its influence on electron focusing is less markedly than the influence of the variations in potential.
用电子捕获检测器，大孔径毛细管色谱柱直接进水样分析7种有机磷农药。
The 7 kinds of organic phosphorus pesticides in injecting water sample wits Gas Chromatography equipped with ECD, large diameter capillary column.
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