The automobile brake pad is a semimetal ceramic base automobile brake pad with high safety and reliability, and a preparation method is simple and reliable.
本发明是一种安全性和可靠性高的半金属陶瓷基汽车刹车片，其制备方法简单可靠。
What's the best way to whisk astronauts to safety if their rocket were to explode on the launch pad?
如果航天员乘坐的火箭即将在发射台上爆炸，那最好的逃生方式是什么？
What's the best way to whisk astronauts to safety if their rocket were to explode on the launch pad?
如果航天员乘坐的火箭即将在发射台上爆炸，那最好的逃生方式是什么？
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