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【单选题】
关于动量守恒条件和机械能守恒条件,以下说法中正确的是A.
所受合外力为零，内力都是保守力的系统，其动量和机械能必然同时守恒
B.
外力对一个系统做的功为零，则该系统的动量和机械能必然同时守恒
C.
不受外力，且内力都是保守力的系统，其动量和机械能必然同时守恒
D.
不受外力的系统，其动量和机械能必然同时守恒
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【简答题】After the violent earthquake that shook Los Angeles in 1994, earthquake scientists had good news to report; The damage and death toll (死亡人数) could have been much worse. More than 60 people died in thi...
【单选题】The earthquake which happened in Japan __ March,11 th , 2011 was a big disaster(灾难).
A.
at
B.
on
C.
in
D.
to
【单选题】听力原文： Geologists say they knew that a large earthquake was coming in South Asia, but they did not know when. The Himalayan Mountains were formed some 150 million years ago after the landmass that is n...
A.
Antarctica
B.
Africa
C.
Australia
D.
America
【单选题】 Passage AAfter the violent earthquake that shook Los Angeles in 1994, earthquake scientists had good news to report: The damage and death toll could have been much worse.More than 60 people died in t...
A.
A
B.
B
C.
C
D.
D
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