Oil is cracked by heating under pressure.
石油在一定压力下加热分解。

Oil is cracked by heating under pressure.
石油在一定压力下加热分解。
Wood blocks may compress a great deal under pressure.
木块受压时可缩小很多。
Propylene,the common petroleum gas,is subject to gasification under heating and liquification under pressure.
丙烯是一种受热易气
、受压易液
的常用石油气。
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