西安市疾病预防控制中心对发热学生进行了采样检测，其中14例阳性(男11例，女3例)，确诊为甲型h1n 1流感病例。
Xi 'an Center for Disease Control and Prevention conducted a sampling inspection fever students, of which 14 were positive (11 males and 3 females), diagnosed as influenza a H1N1 influenza cases.
本文提出恒频采样电流跟踪型PWM方式，并对其开关策略进行了理论分析。
The fixed frequency sample PWM method is put forward in this paper together with the theoretical analysis about their switch strategy.
在流场测试的基础上，采用等动采样的原理，对PD C型旋风管内的颗粒浓度分布进行了全面系统地测试。
Based on the measurement of flow field, the particle concentration distribution in the PDC type cyclone tube was studied by isokinetic sampling method.
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