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The engineer has introduced useful machineries to save labour in the power plant
The engineer has introduced useful machineries to save labour in the power plant
游客
2023-12-11
54
管理
问题
The engineer has introduced useful machineries to save labour in the power plant.
选项
答案
machineries machinery
解析
machinery是一个集体名词,表示机器的总称,不能用作可数名词,因此也没有复数形式。
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