摆动区的基本方位和中间基本方位设有瞄准点以及相同的磁场。

Swinging area provided with sighting points at cardinal and intercardinal points, and with uniform magnetic field.

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摆动区的基本方位和中间基本方位设有瞄准点以及相同的磁场。

Swinging area provided with sighting points at cardinal and intercardinal points, and with uniform magnetic field.

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