The effects of opening flask temperature and cooling rate on low and high temperature age-hardening alloy casting are tested and studied.

试验研究了开箱温度和冷却速度对低、高温时效型合金时效硬化效果的影响。

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These Fieldbuses which are not completely opening to each other are incompatible and their transfer rate is low, further more the communication distance also limits within several kilometers.

这些现场总线之间没有兼容性，开放性不强，而且其传输速率不高，通信距离也限制在几千米以内。

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