... sleep stage change frequency 睡眠期改变频率 static frequency change 静态变频 high-frequency change over switch 高频转换开关 ...
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The alternate test of static load and dynamic load on RC beam serves the study of the frequency change disciplinarian from integrity to destroy of RC beam.
通过对钢筋混凝土梁进行不同荷载等级下静载和动载的交替实验，得到混凝土梁从完整到破坏的频率变化规律。
Transformer: It belongs to static EM, It can be used to change the Voltage, the Current, the phase No., the frequency and the phase of the Electrical power.
变压器：属于静止电机，可改变交流电能的电压，变压器：属于静止电机，可改变交流电能的电压，甚至也可改变相数、频率及相位。甚至也可改变相数、频率及相位。
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