瞄准设备是用于初始定向的重要设备，必须对其进行定期计量检定。

The aiming equipment is an important one for initial orientation, which must be regularly measured and verified.

youdao

瞄准设备是用于初始定向的重要设备，必须对其进行定期计量检定。

The aiming equipment is an important one for initial orientation, which must be regularly measured and verified.

youdao