住宅的大门外有一根竖杆，上面安装着风向标。
Erected outside the front door of this house was a pole equipped with a wind vane on top.
对带有预定时标齿轮四杆刚体导引机构生成进行了数学描述。
Mathematic description of generation of rigid body geared four bar guidance linkage with prescribed timing is given.
仪表件、螺栓、螺帽、锻造轴、调节杆、非标、美标、英标等。
Instrumentation parts, bolts, nuts, forging shaft, regulation pole, non-standard, American standard, British standard, etc.
本实用新型涉及一种超平尺，它由：调整螺旋杆、固定托、螺钉、超平板、超平尺、水平标、支架构成。
The utility model relates to a super flat ruler which is composed of adjusting screw rods, a fixed support, a screw, a super flat plate, a super flat ruler, a horizontal scale and a bracket.
本实用新型涉及一种超平尺，它由：调整螺旋杆、固定托、螺钉、超平板、超平尺、水平标、支架构成。
The utility model relates to a super flat ruler which is composed of adjusting screw rods, a fixed support, a screw, a super flat plate, a super flat ruler, a horizontal scale and a bracket.
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