如果物体的线速度在这个速度设定值之下，物体将进入静止状态。默认0.15。取值范围0到无穷大。必须为正数。
The default linear velocity, below which objects start going to sleep (default 0.15). Must be positive.
充型速度可以根据设定值精确重复再现，不受炉内泄漏和管路气压波动的影响。
The speed of full mould can be repeated accurately on the basis of given parameter values, and is not influenced by leaking in furnace and pressure fluctuating.
当温度达到设定值时，风机自动转慢，煤燃烧速度放缓，处于保温状态；
When the temperature reaches the set value, the fan automatically turn slow, slower burning of coal, in the insulating state;
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