卦指双燕 窟愉
峪嗤支乞��艶涙万侃��勣音椎祥音出壮繁垢氏阻
奧奧�…稈俳妬諜�稀議燕嶢伉��抜銭垢氏爾試鷹脅音孀傀皐勣  繍孔温狛��酔匯繁爾試/倖嬖催枠。陳倖奧奧嬬校羨和遍孔��祥繍誼欺yaloo議楳逋。 br />

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敬友漬悶議僉可麼勣頁貫膿業、嵎楚、勺鯉眉宀岻寂俶箔倖峠財泣。泌惚頁匯違議弌侏劭陣敬友��膿業�垉嘆司悩榜慴���麼勣頁嵎楚才勺鯉��匯違脅僉喘PVC可創��崛噐�駭義�敬友才寄侏劭陣敬友��挫謹汽了喘議脅頁序笥可創��序笥可創奉來脅氏嗤議。
和中峪墮徭忽翌議匯鐙猟�廝�
Material ideal for use in pressurised non-rigig airship envelopes would have the following properties:
1. High strength
2. High strength to weight ratio to mininise the weigh of envelope
3. Resistance to environmental degradation through temperature ,humidity and ultraviolet light.
4. High tear resistance to give damage tolerance
5. Low permeability to minimise helium loss.
6. Joining techiques that produce strong and reliable jionts,not subject to creep rupture
7. Low creep to ensure that the envelope shape is maintained through its life


現揮��ro戦中敬腎友公熱祥嬬恫��音俶勣徭失崙恬議´´
奧奧�…稈俳妬諜�稀議燕嶢伉��抜銭垢氏爾試鷹脅音孀傀皐勣  繍孔温狛��酔匯繁爾試/倖嬖催枠。陳倖奧奧嬬校羨和遍孔��祥繍誼欺yaloo議楳逋。 br />

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卦指双燕