单选题：A great deal has been done t0 remedy the situation．

题目内容：

A great deal has been done t0 remedy the situation． A．maintain
B．improve
C．preserve
D．protect

参考答案：

答案解析：

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下列图形可以衍变成双向表的是（　）。A．系统结构图 B．模型图 C．层次结构图 D．流程图

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