Opentype hot nozzle: product design and good appearance of steel and accessories with Germany imported material, uniform heating, low cost, good appearance molding products.
开放式：热嘴产品设计外观好与钢材及配件都用德国进口的材质，发热均匀，成本较低，成型的产品外观好。
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This paper presents the results and analyses of open water tests of tandem propellers in a nozzle of accelerating flow type.