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固体火箭推进剂
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衬层
使推进剂药柱牢固地黏接到绝热层或发动机壳体上的一层黏弹性物质。是固体火箭发动机的重要组成部件之一。
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landscape driving force
Landscape dynamic
landscape ecological aesthetic evaluation
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Landscape Feeling
landscape,Flower,Bird by Yun Shouping
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