对五轴联动铣床采用锤击脉冲激励法和变时基采样方法进行实验模态分析，获得机床的各阶固有频率、振型及其相应的振型动画。
The experimental modal analysis of five-axis linkage milling machine is made by using hammer-hitting pulse-inspirit method and change time based sampling method.
将XB4450仿型铣床改造成四轴三联动数控铣床，并采用交流伺服驱动。
The XB4450 imitating milling machine was transformed into four axes three linkages numerical control milling machines driven by ac servo.
VMC - L 850立式加工中心采用FANUCOI系统，圆盘式刀库，三轴联动，可加工复杂型面的各种工序，适用于各种零件批量加工。
VMC-L850 vertical machining center adopts FANUC OI system, with disc knife library, three-axis linkage. It can process a variety of complex surfaces processes.
将XB4450仿型铣床改造为四轴三联动的数控铣床，可以加工复杂的曲线、曲面。
The XB4450 imitating milling machine transformation is four axes three linkages numerical control milling machines. It may process the complex curve, the curved surface.
目的探讨12导联动态心电图对老年人心绞痛型冠心病的临床价值。
Objective To explore the clinical value of 12 leading dynamic electrocardiogram in old patients with angina coronary artery disease.
目的探讨12导联动态心电图对老年人心绞痛型冠心病的临床价值。
Objective To explore the clinical value of 12 leading dynamic electrocardiogram in old patients with angina coronary artery disease.
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