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【单选题】
不能在不同用户之间共享数据的方法是( )A.
通过Cookie
B.
利用文件系统
C.
利用数据库
D.
通过ServletContext对象
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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皮皮学刷刷变学霸
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A.
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【单选题】如图所示，一平面波在介质中以速度u=20m/s沿，轴负方向传播，已知A点的振动方程，为y=3COS 4πt(SI)，以A点为坐标原点的波动方程为( )。
A.
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D.
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