four-screw leveling head 四螺钉安平头
four way leveling 两向四面调平
four-way leveling 纵横向调平
four order leveling 四等水准测量
four grade leveling survey 四等水准测量
The competition in their personal mapping equipment operating skills, four leveling, traversing the contents of such skills as the main competition.
本次大赛以个人测绘仪器操作技能、四等水准测量、导线测量等技能为主要竞赛内容。
Equipped with four hydraulic level of support, quickly leveling rig is simple, safe and reliable.
装有四个液压水平支撑，可迅速调平钻机，操作简便，安全可靠。
The use of four Xizui support, and a multi-chassis connectivity freedom, can make Xizui with automatic leveling the ground situation, maintaining a Xizui inhaled air and ground space.
该吸嘴采用四轮支撑，与底盘采用多自由度联接，使得吸嘴能随地面状况自动找平，保持了吸嘴与地面吸入气流间隙。
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