Kind of measurement Net or gross calorific value, Wobbe index, Density and minimum air requirement.

测量种类净热值或总热值，华白指数，密度，最少空气需要量。

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To implement this clean air requirement, the Act contains special permit provisions and requires changes in state implementation plans.

为实施清洁空气要求，该法案包含了许多特别许可条款并要求州对原来的实施计划做出调整。

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Some problems exist during the operation of cartridge filter, such as little effect of blast cleaning, minor air requirement and low filtering rate, etc.

滤筒式除尘器在使用过程中，普遍存在喷吹清灰效果差、处理能力小、过滤速度低的问题。

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"The high level of investment in high-end combat aircraft and air defence systems by, for example, Russia and China... indicates that the essential requirement for control of the air has not been lost on nations whose future interests and political orientation may not necessarily be well disposed to the UK, " he said, according to the newspaper.

BBC: RAF Typhoon jets

We need to really think seriously about a variety of alternative launch facilities and, also, a launch infrastructure that's really more suited to so-called launch-on- demand, which the Air Force has talked about at various times as a future requirement.

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If passed, the requirement would apply to U.S. and foreign carriers with Web sites marketing air transportation to U.S. consumers for travel within, to or from the United States.

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