介绍了模拟港口岸形、物标回波和其他助航物标回波的生成，雷达回波的干扰、遮挡和衰减，固定距标圈、电子方位线和活动距标圈的显隐与图像的有关裁剪算法等。

Also the details about the coast, target and other navigational subjects echo and the interference of echo and Ring, Ebl, Vrm of Radar and clipping algorithm etc.

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甜甜圈，这可能是33至45美分的费用每名标25美分。

The donuts, which probably cost 33 to 45 cents each, were marked at 25 cents.

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但也可按照产品图纸要求标在护罩、保持架、挡圈，密封或防尘装置的端面上。

But can also be marked in accordance with the requirements of Product drawings at guard and maintain the planes, ring, seal, or device-side surface dust.

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