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Which statement about windows and blocks is true?（）
A:Transaction management is block-oriented rather than window-oriented. 
B:Forms automatically navigates to an item located in an activated window. 
C:A window may contain multiple blocks, but each block can only span one window. 
D:A window can contain multiple canvases, and an item can be located on multiple canvases. 

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出自：Oracle认证

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