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t\u4e00\u6c34\u5728\u6c89\u6dc0\u6c60\u505c\u7559\u65f6\u95f4\uff0cs;
uo\u4e00\u9897\u7c92\u7684\u622a\u7559\u6c89\u901f\uff0cm\/s;
v\u4e00\u6c34\u6d41\u7684\u6c34\u5e73\u6d41\u901f\uff0cm\/s\u3002<\/figcaption><\/figure>\n\n\n\n<\/figure>\n\n\n\n
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