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【多選題】
火車軌道在轉彎處外軌高于內軌，其高度差由轉彎半徑與火車速度確定.若在某轉彎處規定行駛的速度為v，則下列說法中正確的是（ ）.
A.
當火車以v的速度通過此彎路時，火車所受重力與軌道面支持力的合力提供向心力
B.
當火車以v的速度通過此彎路時，火車所受重力、軌道面支持力和外軌對輪緣彈力的合力提供向心力
C.
當火車速度大于v時，輪緣擠壓外軌
D.
當火車速度小于v時，輪緣擠壓外軌
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舉報參考答案：
舉一反三
【單選題】How does Grace like the kung fu movie?
A.
She thinks it’s great.
B.
She doesn’t like it at all.
C.
She enjoys it very much.
【單選題】What kind of movie is going to be on?
A.
A love movie.
B.
A kung fu movie.
C.
A detective movie.
【單選題】Who will go to see the movie at last?
A.
The man himself.
B.
Grace.
C.
Grace and the man.
相關題目：
【單選題】How does Grace like the kung fu movie?
A.
She thinks it’s great.
B.
She doesn’t like it at all.
C.
She enjoys it very much.
【單選題】What kind of movie is going to be on?
A.
A love movie.
B.
A kung fu movie.
C.
A detective movie.
【單選題】Who will go to see the movie at last?
A.
The man himself.
B.
Grace.
C.
Grace and the man.
參考解析：
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