The "Tentative Tariff Rate Table for Imported Goods" issued by the Ministry of Finance shows that the import tariff on natural rubber will be lowered to 2,000 yuan/ton next year, and currently it is 2,600 yuan/ton. The provisional tax rate for anthracite, coking coal, other bituminous coal and coal-based coke will remain zero next year, and the provisional tax rate for imports of polysilicon is 1%.
Magnetostrictive level sensor is composed of three parts: probe rod, circuit unit and float. To measure, the circuit unit generates pulses of current that travel down the magnetostrictive line and generate a circular magnetic field. A float is arranged outside the probe rod, and the float moves up and down along the probe rod with the change of liquid level. The float generates a magnetic field at the same time because it is fitted with a set of permanent magnets. When the current magnetic field meets the float magnetic field, it produces a "twisting" or "return" pulse. The time difference between the "return" pulse and the current pulse is converted into pulse signals to calculate the actual position of the float and measure the liquid level.
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