问答题

具有压电效应的材料有(____)

答案：石英晶体或压电陶瓷或高分子压电材料

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Mask Changing originated at the end of the Ming and the beginning of the Qing Dynasty.

答案：正确

平面2x-3y+6z-4=0与平面4x-y+5z+2=0交线的对称式方程是(x+1)/-9=(y+2)/14=(z-0)/10？

答案：正确