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【單選題】
實驗中，下列說法正確的是（▲）
A.
應使小球每次從斜槽上相同的位置自由滑下
B.
斜槽軌道必須光滑
C.
斜槽軌道末端可以不水平
D.
要使描出的軌跡更好地反映真實運動，記錄的點應適當少一些
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舉報參考答案：
舉一反三
【單選題】What does the man want to do before leaving?
A.
Send some emails.
B.
Have breakfast.
C.
Buy a train ticket.
【單選題】What should Betty do according to the man?
A.
Eat seafood.
B.
Have a good rest.
C.
Exercise more
相關題目：
【單選題】What does the man want to do before leaving?
A.
Send some emails.
B.
Have breakfast.
C.
Buy a train ticket.
【單選題】What should Betty do according to the man?
A.
Eat seafood.
B.
Have a good rest.
C.
Exercise more
參考解析：
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