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Abstract This study applies the supersonic theory to measure the liquid level, and that can transfer it to the physical quantities of weight or volume through the container size and the liquid density. The application of this device is very wide. For exam...

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一朋友女朋友即將到國外出差,走之前說給他把屋子換一個新床。他高興的不行,天天拉著我們吹噓他女朋友對他有多好。結果貨一到,他抱著我就淚奔了。。。哭的那個慘呀。。。...

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