Since the water heater will operate far less frequently, solar will extend its life significantly.
由于热水器的运作频繁得多，太阳能将大大延长其使用寿命。
But that's not very reasonable, so sometimes the soot-blowers are operated more frequently, sometimes far less frequently.
但这种定时定量的吹灰方式并不合理，常常造成吹灰不足或过于频繁。
The problem of three-dimensional seepage analysis for the complex rock foundation is less frequently studied so far at home and abroad.
复杂岩基的三维渗流分析问题，目前国内外研究甚少。本文提出了一个以电网络法为基本求解手段的分析方法。
The problem of three-dimensional seepage analysis for the complex rock foundation is less frequently studied so far at home and abroad.
复杂岩基的三维渗流分析问题，目前国内外研究甚少。本文提出了一个以电网络法为基本求解手段的分析方法。
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