On windy occasions such as the approach of a tropical cyclone , air streams of high wind speed may emerge from mountain gaps 在刮大风的时候,例如在热带气旋逼近时,高速气流会在山峡形成。在这些高速气流之间,会出现较低速的气流。
In particular , if an aircraft flies from a low - speed air stream to a high - speed air stream , it may experience a large headwind gain leading to a lift of the aircraft 特别要注意的是,当飞机由低速气流进入高速气流时,逆风会大为增强,增加对飞机的浮力。
In particular , if an aircraft flies from a low - speed air stream to a high - speed air stream , it may experience a large headwind gain leading to a lift of the aircraft 特别要注意的是,当飞机由低速气流进入高速气流时,逆风会大为增强,增加对飞机的浮力。
Radar radial winds in fig . 13 show that behind the valleys of lantau island , several streaks of high - speed airflow were generated over the approach and departure areas 图13的雷达径向风速显示背景气流分别冲过大屿山的多个山谷后,在升降区上产生了数道高速气流。
Radar radial winds in fig . 13 show that behind the valleys of lantau island , several streaks of high - speed airflow were generated over the approach and departure areas 图13的雷达径向风速显示背景气流分别冲过大屿山的多个山谷后,在升降区上产生了数道高速气流。
The crystal pvc was crashed by jet - mill to prepare nanocrystal pvc . the crash , degradation and the change of morphology and crystalline structure changes of pvc was studied by ftir , sem , dsc , tem 用气流磨对结晶pvc进行粉碎,制备了纳米晶pvc ,研究了在高速气流作用下pvc的破碎降解、颗粒形态和微晶结构变化。
Consequently , strong wind shears exist on the periphery of a jet stream , both vertically and horizontally . in long - haul air travel , pilots may actually choose to ride the jet streak to save fuel and reduce flight time 相反,若航道配合的话(一般是由西至东飞行) ,飞行员往往会骑上高空急流,以利用它的高速气流去大大缩短飞行时间以及节省燃料。
Jet stream is an elongated belt of high speed air , typically found in upper tropospheric westerly flow round the globe . a jet stream may stretch over tens of thousands of kilometres in length from west to east and a few hundred kilometres in width from north to south 高空急流是围绕地球的一条强而窄的高速气流带,集中在对流层上部或平流层中,在中高纬西风带内或在低纬度地区都可出现。
The crystal pvc is crashed by jet - mill to prepare nanocrystal pvc . the crash , degradation and the change of morphology and crystalline structure changes of pvc is studied by ftir , sem , dsc , tem . the self - plasticization of nanocrystal pvc is studied , too 用气流磨对结晶pvc进行粉碎,制备了纳米晶pvc ,研究了在高速气流作用下pvc的破碎降解、颗粒形态和微晶结构变化,研究了纳米晶pvc对pvc的增塑作用。
The turbocharger noise is formed by the rotation noise resulting from the periodical air cutting of the fan blade and the turbulent noise of high - speed gas flows . as a continuous high frequency noise , it mainly falls between the 500 to 10 000 hz range 涡轮增压器的噪声是由于叶片周期性地切割空气产生的旋转噪声和高速气流形成的湍流噪声而形成的,是一种连续性的高频噪声,主要分布在500 ~ 10000hz的频率范围。