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【多選題】
一列橫波沿一直線在空間傳播，在某一時刻直線上相距s的A、B兩點均處于平衡位置，且運動方向相反，在A、B間僅有一個波峰。若過時間t，B質(zhì)點恰好第一次到達(dá)波峰位置，則該波的波速大小可能是 （ ）
A.
B.
C.
D.
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舉報參考答案：
舉一反三
【單選題】The thieves ran away as soon as the alarm _____.
A.
gave off
B.
put off
C.
showed off
D.
went off
【單選題】Bill Gates is so _____ that he has given away most of his money to charity.
A.
brave
B.
smart
C.
generous
D.
skilful
【單選題】All the athletes competed _____ each other for gold medals in the Olympic s.
A.
against
B.
for
C.
between
D.
over
【單選題】All his free time is _____ by charity work, but he feels it meaningful.
A.
put up
B.
given up
C.
picked up
D.
taken up
相關(guān)題目：
【單選題】The thieves ran away as soon as the alarm _____.
A.
gave off
B.
put off
C.
showed off
D.
went off
【單選題】Bill Gates is so _____ that he has given away most of his money to charity.
A.
brave
B.
smart
C.
generous
D.
skilful
【單選題】All the athletes competed _____ each other for gold medals in the Olympic s.
A.
against
B.
for
C.
between
D.
over
【單選題】All his free time is _____ by charity work, but he feels it meaningful.
A.
put up
B.
given up
C.
picked up
D.
taken up
參考解析：
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