请教英语单复数问题The motor can operate with high efficiency even whe

请教英语单复数问题
The motor can operate with high efficiency even when the output power is low.
The motor can operate with high efficiencies even when the output power is low.
The motor can operate with a high efficiency even when the output power is low.
哪一句正确?
菲儿雪 1年前 已收到1个回答 举报

rd68 幼苗

共回答了11个问题采纳率:100% 举报

efficiency是不可数名词,效率,怎么会有复数.第一句是对的

1年前

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