含氧化限制孔的VCSEL具有低的阈值电流，但氧化孔的存在也会加大串联电阻。
While AlAs oxide confined aperture may reduce the threshold current of vertical-cavity surface emitting lasers (VCSELs), it might also enlarge the series resistance of the VCSELs.
尾气中一氧化碳的排放量限制在4.5% 以下。
The limit for carbon monoxide is 4.5 per cent of the exhaust gas.
高硫煤燃烧过程中的二氧化硫的排放是受到法律限制的。
The emission of sulfur dioxide when high-sulfur coal is burned is restricted by law.
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