B. ALL undimensioned features shall be located within a tolerance of . 005 from datum zero o.

所有未注的特征相对于基准零点的位置偏差须在0.005之内。

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In migration processing, we usually require that migration datum is horizontal and that zero point for migration should be on the ground surface on which shot point and receiving points lie.

在作偏移处理时，一般要求偏移基准面是水平的，且偏移的零点应在激发和接收的地表。

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