NCE2L71SW: Summary Writing [Ref. at page 321 in nce2, lesson 71)
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【多选题】输气管中生成水合物的真实情况The real situation of hydrate formation in gas pipeline:()
A.
气体在管内高速度流动,不可能在某一点生成水合物,而往往在数十米的管段上形成水合物。The gas flows in the tube at a high speed, so it is impossible to form hydrate at a certain point.
B.
形成水合物会改变压降曲线形状。Hydrate formation changes the shape of the pressure drop curve.
C.
生成水合物时伴随有热效应,要放出热量。熔解水合物时,要吸收热量。水合物的熔解热为335KJ/kg,对管线温降曲线有影响。The formation of hydrate is accompanied by a thermal effect, to release heat. When you melt hydrate, you absorb heat. The melting heat of hydrate is 335KJ/kg, which affects the temperature drop curve of pipeline.
D.
此外,还有不少难以考虑周全的因素,如:局部阻力、气流漩涡、结晶中心等,因而有些书上只标明水合物的可能形成区。In addition, there are many difficult to consider factors, such as: local resistance, airflow vortex, crystallization center, and so on, so some books only indicate the possible formation area of hydrate.
【单选题】下面对本文内容理解不正确的一项是 (3分) ( ) A .本文第一段写出了邹忌头脑冷静,不为奉承所迷惑。 B .本文第二段运用两组排比句式增强了语势,给人以无可辩驳之感。 C .本文第三、四段从侧面表现邹忌的精明能干,具有治国之才。 D .本文的主旨是通过邹忌“暮寝而思之”,悟出了人们由于种种原因,不会说出事情的真相的道理。