【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】How many syllables in "hydrate"?
【多选题】Methane hydrate is ______ .
A.
a mixture of methane and water
B.
a crystalline solid that consists of a methane molecule surrounded by a cage of interlocking water molecules
C.
more stable at higher pressure
D.
more stable at higher temperature
E.
often found in natural gas pipelines
【单选题】Many experts __ a low protein, high carbon hydrate diet.
【单选题】What is the meaning of hydrate?
【单选题】Which of the following is not hydrate ?
【简答题】按照综合楼图纸,完成综合楼基础层KZ3的清单工程量和定额工程量计算。其中,综合楼基础层KZ3有 个,每个KZ3混凝土工程量 m3, 整个基础层KZ3混凝土工程量 m3;每个KZ3混凝土埋入土层里的工程量 m3,计算整个基础层基础J3回填土扣减混凝土柱的工程量(即KZ3混凝土埋入土层工程量) m3 。混凝土柱的清单工程量和定额工程量是否相同?
【单选题】以下说法错误的是( )。
A.
指示具有强制约束作用,要求下级机关必须遵守和执行
B.
决定具有指导性,具有较强的理论性和政策性,是指导工作的准则
【多选题】The unconventional gas often includes gas hydrate and ( ).
【简答题】完成作业: (思考题,抄好题目,作答在作业本上) 1)抄写《师说》一遍,并逐句对译。 2)熟读课文三遍,并尝试背诵第1-2-3段。 (*口头作业) 3)摘录韩愈的文学常识、文章主旨、中心论点和“六艺”经传。 4)积累PPT中“词句注释”中的文言语法现象(活用词、古今异义、一词多义和特殊句式)。 5)列举第2段作者运用哪些论证方法批判“ 耻于从师不良风气 ”?