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【单选题】
一平面简谐波在弹性媒质中传播时，下列结论正确的是（）。A.
媒质的振动动能增大时，其弹性势能减小，总机械能守恒
B.
媒质在其平衡位置处弹性势能最大
C.
媒质的振动动能和弹性势能都能做周期性变化，但二者的位相相向
D.
媒质的振动动能和弹性势能位相在任一时刻都相同，但二者的数值不等
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】患者郑X,男,4岁,以高热抽搐4小时之主诉于8月15日急诊来院。查体:T40°C,神志不清,面色苍白,四肢凉冷,脉细速。血像示白细胞总数18×10°/L,中性90%。追问病史其母述前一日曾进食未洗的葡萄 (1)该患儿的诊断应首先考虑
A.
乙型脑炎
B.
暴发型流脑
C.
中毒性菌痢
D.
败血症
E.
脑型疟疾
【单选题】听力原文：W: In these couple of rooms, we have postwar American paintings done in New York in the 1950s. All of this work is considered abstract. M: Hmmm, interesting. Actually, I could never understand mo...
A.
In a studio.
B.
In a gallery
C.
In an art supply store
D.
In a psychologist's office.
【单选题】男,4岁,以高热抽搐4小时于8月15日急诊来院。查体:T40°C,神志不清,面色苍白,四肢凉冷,脉细速。白细胞总数18×109/L,中性90%。追问病史其母述前一日曾进食未洗的葡萄,该患儿的诊断应首先考虑
A.
乙型脑炎
B.
暴发型流脑
C.
中毒性菌痢
D.
脑型疟疾
E.
以上答案都不对
【简答题】この試験は年齢 、誰でも受けられる。
【简答题】The history of modern art begins with Impressionism, a movement started in Paris in the mid-1800’s. At that time many artists painted in a very traditional way that involved spending hours in a studio...
【简答题】Translate the following English sentences from the text into Chinese. 1) These cave paintings are not only one of the oldest but also the most elaborated works of cave art. 2) Animals, such as the buf...
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