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- Multiple ChoicePlease save your changes before editing any questions.
以下哪个是第一类杠杆？
- Multiple ChoicePlease save your changes before editing any questions.
以下哪个是第一类杠杆？
- Multiple ChoicePlease save your changes before editing any questions.
以下哪个是第二类杠杆？
- Multiple ChoicePlease save your changes before editing any questions.
以下哪个是第二类杠杆？
- Multiple ChoicePlease save your changes before editing any questions.
以下哪个是第三类杠杆？
- Multiple ChoicePlease save your changes before editing any questions.
以下哪个是第三类杠杆？