每周期比较两次的相位比较保护。对正半周和负半周各比较一次。
Phase comparison protection where the comparison is made twice per cycle.
第一，与过去比较，各国现在实行反周期财政政策的空间是否更大？
Do countries have more room to use counter-cyclical fiscal policy than they used to?
这是因为Google对一个新站的漫游周期会比较长。
This is because Google for a new station roaming cycle be rather long.
与实测资料比较发现，两者变化趋势基本一致，在短周期波时吻合较好。
The theoretic model is consistent with the observations, especially for short period wave.
与实测资料比较发现，两者变化趋势基本一致，在短周期波时吻合较好。
The theoretic model is consistent with the observations, especially for short period wave.
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