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如图所示,卫星在半径为的圆轨道上运行速度为,当其运动经过点时点火加速,使卫星进入椭圆轨道运行,椭圆轨道的远地点与地心的距离为,卫星经过点的速度为,若规定无穷远处引力势能为0,则引力势能的表达式,其中为引力常量,为中心天体质量,为卫星的质量,为两者质心间距,若卫星运动过程中仅受万有引力作用,则下列说法正确的...
anhedral (allotriomorphic) A morphological term referring to grains in igneous rocks which have no regular crystalline shape. Anhedral forms are developed when a crystal's free growth in a melt is inhibited by the presence of surrounding crystals....
n.crystalline lens suí zhe jīng zhuàng tǐ biàn de gèng jiā bù tòu míng huàn zhě huì fā xiàn shì lì xià jiàng 随着晶状体变得更加不透明,患者会发现视力下降。 As the lens becomes more opaque, the patient notices a reduction in vision....
adj.bright and limpid; transparent; clear; crystalline míng chè de xiǎo xī 明澈的小溪 transparent stream hú shuǐ míng chè jiàn dǐ 湖水明澈见底。 The pond is so clear that you can see its bottom. yuè guāng xia de hú shuǐ míng chè sì jìng ...
根据《北京证券交易所上市公司证券发行与承销业务指引》，以下说法正确的是（ ）。Ⅰ．投资者申购数量不得高于发行公告中确定的申购上限，如超过则该笔申购无效Ⅱ．网上投资者有效申购总量大于网上发行数量时，发行人和主承销商应当按照比例配售原则或北京证券交易所规定的其他配售原则向网上投资者配售股票Ⅲ．主承销商对...
What Does Liquid Crystal Display Mean? A liquid crystal display (LCD) is a type of display technology that makes use of liquid crystals that open or close when stimulated by an electric current. These liquid crystals are the basis for LCD technology. Advertisements LCD is considered a major...
What does a finely crystalline or glassy igneous texture indicate in geology? What is a lahar in geology? What is focus in geology? What are fractures in geology? What are clastic sediments? What is mining geology? What are petrology, stratigraphy, and paleontology?
a如果你知道它可能在哪的话,请给我打电话 If you knew which speech it possibly in, please does telephone to me[translate] a晶间腐蚀合格率 Intercrystalline corrosion qualified rate[translate] aWhat's on the duck's back 什么在鸭子的后面[translate] ...