题目内容

nuance (Para. 2, Line 5): ______

A. little
B. maximum
C. some

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utmost (Para. 3, Line 11): ______

A. little
B. maximum
C. some

refer to (Para. 4, Line 3): ______

A. to mention or to speak about
B. appoint
C. represent

Choose the correct definition for each word.

电梯正常情况下不参与电梯速度控制的元件是（）

A. 变频器
B. 编码器
C. 曳引机
D. 限速器