By 1978, the use of CFCs in aerosol propellants was banned.

自1978年起，含氯氟烃的喷雾剂压缩气体已被禁止使用。

This is true of almost all aerosol propellants.

几乎所有的气雾剂推进剂都是这样。

Typical Assignment: Test burn rates of new propellants.

典型的任务：测试新的推进剂的燃烧率。

For proper combustion it is necessary to atomize the propellants.

为了有效地进行燃烧，推进剂必须雾化。

By 1978, in the USA, the use of CFCs in aerosol propellants was banned.

美国自1978年起禁止在喷雾剂压缩气体中使用含氯氟烃。