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【多选题】
特性因素是用作反映( )等油品的化学组成特性的一种因素。 A 、 B、 C、 D、A.
轻柴油
B.
石脑油
C.
润滑油等重质油
D.
航煤等重质油
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【简答题】Light travels at a speed which is about a million times faster than the speed of sound. In one second, light travels about 300,000km, but sound travels only 344m. You can get some idea of this differe...
【简答题】灭火器有哪些种类?它们各有什么特点?
【简答题】Light travels at a speed which is about a million times faster than the speed of sound. You can get some idea of this difference by watching the start of a race. If you stand some distance(距离) away fr...
【简答题】听力原文： Light travels at a speed which is about a million times faster than the speed of sound. In one second, light travels about 300,000 km, but sound travels only 0. 334 kin. You can get some idea of...
【简答题】Light travels at a speed which is about a million times faster than the speed of sound. You can get some idea of this difference by watching the start of a race. If you stand some distance away fr...
【单选题】听力原文： Light travels at a speed that is about a million times faster than the speed of sound. In one second, light travels about 300, 000 km, but sound travels only about 334 meters. You can get some i...
A.
Light speed is millions of times faster than sound speed.
B.
Light speed is a million times slower than sound speed.
C.
Light speed is about millions of times faster than sound speed.
D.
Light speed is about a million times faster than sound speed.
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