D. The material - radian size and injection plastic machine nozzles radian match.
主进料口弧度尺寸与注塑机喷嘴弧度相配。
First the machine takes off and hovers above the ground by firing downward-facing nozzles.
首先这种机器启动后加热朝下的喷嘴，会在地上盘旋。
When the injection mould machine starts again after its stop, first, use materials to clean the molds hot runners and nozzles, second, perform the commissioning and production.
注塑机在停机后再次开机时，首先用原料清洗模具热流道及喷嘴，再进行调试生产；
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