The engineer has introduced useful machineries to save labour in the power plant

游客2024-12-21 28

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。

转载请注明原文地址:https://tihaiku.com/zcyy/3878670.html

相关试题推荐

随机试题

最新回复(0)

Theengineerhasintroducedusefulmachineriestosavelabourinthepowerplant