皮皮学，免费搜题
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【单选题】
当质点以频率f作简谐振动时,它的动能的变化频率为A.
4f
B.
2f
C.
f
D.
0.5f
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】Question 15 is based on the conversation you have just heard.
A.
Try to be optimistic whatever happens.
B.
Treat others the way he would be treated
C.
Always learn from other's achievement.
D.
Compare his present with his past only.
【单选题】Question 15 is based on the conversation you have just heard.
A.
She has interests similar to Mr. Lee’s.
B.
She has become企iends with Catherine.
C.
She has chosen the m勾or Catherine has.
D.
She has just transferred to the college.
【简答题】试结合实际，论述问题解决的影响因素有哪些?
【简答题】简述思维过程中问题解决的影响因素。(10分)
【单选题】农产品质量追溯系统是食品追溯中最复杂和最艰难的部分,是一个庞大的系统工程,必须建立一个中心、三大模块的农产品质量安全追溯体系,其中一个中心是指( )
A.
管理中心
B.
云端数据中心
C.
生产中心
D.
营销中心
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