目的：探讨老年脑梗塞血液黏滞度变化的规律及临床意义。
Objective To study various rules of blood viscosity and clinical meaning of senile cerebral infarction.
在保证小扰动稳定前提下，电力系统可承受的最大时滞称为时滞稳定裕度。
Delay margin is defined as the maximum time delay that system can sustain without losing its small signal stability.
薄膜开关主要用于低压应用，对磁滞、精确度和可重复性要求较低。
This diaphragm switch is ideal for low pressure applications that require low hysteresis, accuracy and repeatability.
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