The pre-stressed spring component could provide with a greater elastic force when the working stroke is short.
预压缩弹簧合件可以在工作行程不大的条件下提供较大的弹力；
Methods: to observe the change of glucose metabolism of cerebral motor area in stroke patients between pre-acupuncture and after acupuncture during the movement using PET.
方法：用PET观察运动状态下中风患者针刺前后大脑细胞糖代谢变化。
Methods Cerebral blood flows were simulated on hemodynamics models of cerebral blood on condition of normal and stroke with practical measured normal carotid blood pressure pre-ECP and during ECP.
方法 将实际测量的正常的颈动脉血压和进行体外反搏时的颈动脉血压作用于正常情况下和缺血情况下脑血流动力学数学模型，模拟上述情况下脑动脉血流的变化。
Pre-kindergarten through first grade children learn the Zhuyin Fuhao system of phonetic symbols and then study traditional Chinese characters, mastering stroke order and penmanship.
从预幼班到一年级，开始学习注音符号、正体字的笔顺与书写。
Pre-kindergarten through first grade children learn the Zhuyin Fuhao system of phonetic symbols and then study traditional Chinese characters, mastering stroke order and penmanship.
从预幼班到一年级，开始学习注音符号、正体字的笔顺与书写。
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