The use of mobile phones instead of bankcards for credit card consumption began large-scale commercial use. From now on, Beijing's China Mobile users can exchange SIM cards with mobile payment functions for free at six business outlets. On June 9, China UnionPay and China Mobile joint
Abstract : The principle of measuring the oily medium in water by radio frequency admittance and differential pressure level transmitters is used to monitor whether there is a large amount of oily medium in the cooling water tank, so as to judge whether the heat exchange tube in the styrene cooler