Besides, according to the result of the calculating example, a discussion is made about how to determine the mean year of the different observation periods and how to choose the leveling lines.
此外，根据实例计算的结果，讨论了有关中心年代的选取以及观测路线的取舍等问题。
The hand guard helps with screw stabilization, houses a stud finder and a laser guide to project plum lines and assist with leveling.
护手可以帮助稳定螺丝，内置一个寻柱设备和一个激光辅助系统。该激光辅助系统可以在墙上投射铅垂线，辅助水平垂直定位。
The hand guard helps with screw stabilization, houses a stud finder and a laser guide to project plum lines and assist with leveling.
护手可以帮助稳定螺丝，内置一个寻柱设备和一个激光辅助系统。该激光辅助系统可以在墙上投射铅垂线，辅助水平垂直定位。
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