In the pure wave tests different models present different change on the force after added weigh.
在纯波条件下，增加配重后，不同模型的受力表现出不同的规律。
Suppose the speakers both emit a pure sinusoidal sound wave of constant frequency.
假定两个扬声器都发射恒定频率的纯正弦声波。
Methods patients were randomly assigned to electrocardiogram ST section change group(A) or pure T wave change group(B), receiving coronary angiography.
方法按照病人的心电图ST段压低或抬高和单纯T波改变者分为A、B两组，行冠脉造影。
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