曾有位著名的科学家,写了一篇论文 'heavier than the air' .给出数学证明所谓飞行器不可能.
the very next day. Wright brothzer approved he was wrong.
曾有位著名的科学家,写了一篇论文 'heavier than the air' .给出数学证明所谓飞行器不可能.
the very next day. Wright brothzer approved he was wrong.
WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.
Copyright ©1998-2025 wenxuecity.com All rights reserved. Privacy Statement & Terms of Use & User Privacy Protection Policy