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绳以 \vec F = 100 N 在水平面上 30° 拉车，车移动 \vec d = (10, 0) m：（答： J。）
绳以 \vec F = 100 N 在水平面上 30° 拉车，车移动 \vec d = (10, 0) m：（答： J。）
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