... 随机波动 random fluctuation; 随机不稳定性 stochastic instability; 随机不相关 stochastic independence; ...
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由于风能的能量密度低，具有不稳定性和随机性，控制技术是大型风力发电机组安全高效运行的关键。
Because wind energy has lower density, instability and randomicity, control is vital for safety and efficiency of a large-scaled wind turbine.
方法：60例不稳定性心绞痛患者随机分为三组：A组，20例，西药常规治疗（简称对照组）；
Methods:60 cases of unstable angina pectoris (UAP) disease were divided into 3 groups:group A, 20 cases, treated with normal medicine;
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