...测器到达上述高度开始,依次经历进在已经进行的16次火星着陆探测中,成功着陆的仅 入段(Entry Phase)、下降段(Descent Phase)和着陆段有6次,着陆成功率不足四成。火星多变的地理环 (Landing Phase),完整的火星EDL过程如图1所示。
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受拉泊松系数回归曲线存在上升段和下降段;
The tension Poisson ratio is negative, and its regression curve shows upward section and downward section.
此类结构滞回曲线的滞回环饱满,骨架曲线下降段比较平缓;
The load and displacement loop is plump, and the descent part of framework curve is smooth in the structure.
本文详细分析了出现在电流上升段,坪段及下降段密度极限破裂的特征。
In this paper, we carefully analyze the characteristics of density limit disruptions during current ramp-up, flattop and ramp down phases.
It dropped dramatically in the period from 1954-- this is these filled black bars refer to this axis, polio cases per 100,000 population dropped down to only three or four cases by 1956.
患病率在一九五四年后的,一段时间里急剧下降,该坐标轴上的这些黑色柱形图表明,到一九五六年,小儿麻痹症的发病率,已经降低至每十万人中仅三到四人发病
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