punch card是什么意思

用法例句

Effects of perforation and fertilization on the turf quality of Kentucky bluegrass;

打孔和施肥处理对草地早熟禾草坪质量的影响

As the one-pulse energy is raised, the number of pulses required for one perforation increases rather than drops at two one-pulse energy values, 85mJ and 181mJ.

利用纳秒激光在薄铜片上进行多脉冲打孔时 ,出现一种反常现象 ,在 2个值处 ,随着单脉冲能量的提高 ,打 1个孔所需脉冲次数不但没有减少 ,反而增加 ,根据环境气体分解消耗激光能量解释了第 1处的反常现象 ,并首次提出了等离子体受光场力的作用 ,在激光作用初期 ,使靶表面形成一层致密的等离子体 ,阻挡了后续激光到达靶材 ,引起了第 2处的反常现

Clinical application of ovarian drilling technique under laparoscopy in treatment of PCOS;

腹腔镜下卵巢打孔术治疗多囊卵巢综合征

Illumined by Shortest Path Algorithm,the paper proposes a genetic algorithm to solve the path optimization in the drilling of PCB.

将遗传算法求解TSP(TravelingSalesmanProblem)问题的方法应用于印制板打孔工艺的最优路径选择中,根据印制板上孔的位置找出打孔的最短路径,实现高效率打孔。

Laser perforating technology of tipping paper;

水松纸激光打孔技术研究

Laser perforating system in scanning is widely used to perforate some thin nonmetal material, such as paper, leather and plaster, and so on.

激光扫描打孔系统广泛用于非金属薄型材料(如纸张、皮革、膏药)的加工,其结构简单、可靠,打孔效率高,打出小孔密集、整洁。