造成当前这种趋势的主要原因很可能是云量发生了基本快速的变化，而降雪可能也有一定影响。
The chief cause of the current trend was likely to be a fundamental shift in climate, although local changes in cloud cover and snowfall may also be having an effect.
研究了酸度、碘化钾浓度、还原剂用量对测定影响。测定的相对标准偏差为1.08%，方法简单、快速。
Effects of acidity, concn. of potassium iodide and dosage of reducing agent on determination are investigated. It is simple and rapid with relative standard deviation 1.08%.
结果表明，质量松弛时间是影响快速瞬态质量传递规律的重要因素，质量扰动浓度及扰动方式等对快速瞬态质量传递规律也有一定影响。
The results indicate that mass relaxation time has important influence on the mass transfer process. Mass disturbance concentration and manner also have some effect on it.
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