Abstract: Provided is a blocking-type surge protector for accelerated turn-off, comprising: a first transistor (M1), a drain electrode thereof connected to a first port; a second transistor (M2), a drain electrode thereof connected to a source electrode of the first transistor (M1), and a source electrode thereof connected to a gate electrode of the first transistor (M1), the source electrode thereof being further connected to a second port; a first resistor (R1), connected between the drain electrode of the first transistor (M1) and the gate electrode of the second transistor (M2); and an accelerated turn-off module (10), connected between the drain electrode of the first transistor (M1) and the gate electrode of the second transistor (M2).

Abstract: An automatic vending machine includes a cabinet, a plurality of item columns, a pickup port and a delivery apparatus, and the delivery apparatus includes a hopper and a hopper drive mechanism. An item dispensing method of the automatic vending machine includes: determining, according to items to be purchased, all of item combination manners having a lowest number of item dispensing operations as candidate item combination manners; determining all of pickup manners for picking up items in each of the candidate item combination manners; determining all of item dispensing paths in one-to-one correspondence to all of pickup manners of all of the candidate item combination manners; and selecting, from all of the item dispensing paths, an item dispensing path having a highest efficiency as a target item dispensing path, and controlling, based on the target item dispensing path, the hopper to dispense items.

Abstract: The present application discloses a nanometer self-locking bentonite film-forming agent, a method for preparing the same, and a film-forming drilling fluid.