Seasonalfluctuation in incidence of this disease was observed, being higher in the spring and summer and lower in the autumn and winter.
发病的年度波动不明显,但有季节性波动,即春夏高于秋冬季。
2
The distribution, breeding habits and seasonalfluctuation of the various mosquito larvae were studied at eight breeding places in the Mountain Resort from 1985 to 1995.
As the result of seasonalfluctuation of water, the total Hg concentration of water and sediment would be degressive in sequence of low water, flush time and ordinary level.