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After operation, we should stop the electric motor.（）
- A、操作完后，我们要发动电动机。
- B、操作完之前，我们要关掉电动机。
- C、操作之前，我们要发动电动机。
- D、操作完后，我们要关掉电动机。
参考答案
更多 “After operation, we should stop the electric motor.（）A、操作完后，我们要发动电动机。B、操作完之前，我们要关掉电动机。C、操作之前，我们要发动电动机。D、操作完后，我们要关掉电动机。” 相关考题
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