Cheng的模型描述了在黑洞持续吞食恒星时，热等离子体反复而周期性的被注入银河晕这样的震荡波是如何形成的。
Cheng's model describes how, as the black hole continues to devour stars, shockwaves are created as hot plasma is repeatedly and periodically injected into the halo.
产品有：热熔标线涂料、常温标线涂料、双组份涂料、震荡标线涂料、道路划线设备、玻璃微珠，下涂剂等各种道路标线涂料。
Products include: hot melt marking paint, normal temperature reticule coating, a two-component coatings, concussion marking paint, glass beads, coating agent under various road marking paint.
震荡动作会使燃料床抖动，因此，相应的排热设计要比滑动式炉栅的更为慎重一点。
The vibrating action creates some agitation to the fuel bed and thus, the design heat release is a little more conservative than for a traveling grate.
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