单词：refractory cover
refractory cover的用法和样例：
例句
- The injection mould for a duplicator cover plate is designed.设计了复印机盖板的注塑模具。
- Remove the cover plate of the relief valve by removing the four connecting screws.通过拆卸四个连接螺丝来拆卸安全阀盖板。
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