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【单选题】
弹簧振子沿直线作简谐振动，当振子连续两次经过相同位置时______。A.
加速度相同，动能相同
B.
动能相同，动量相同
C.
回复力相同，机械能和弹性势能相同
D.
加速度和位移相同，速度相同
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【简答题】Having waited for 2 hours, the author began to lose _________.(patient)
【简答题】国际电子商务的定义是什么?
【单选题】Having finished her project, she was invited by the school to the new students.
A.
speaking
B.
having spoken
C.
to speak
D.
to have spoken
【单选题】The nurse watched over the patient and waited ______ him day and night.
A.
about
B.
for
C.
on
D.
up
【简答题】Having finished her homework, Ma Li wants some music for relaxation ① . As usual, she starts her computer and goes to Baidu.com to download music files. But this time she is surprised when an announce...
【简答题】Having finished her homework，Ma Li wants some music for relaxation(娱乐)．As usual，she starts her computer and goes to Baidu.Come to download music files.But this time she is surprised when an announceme...
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