【判断题】数据流程图( DFD )是用于描述结构化方法中详细设计阶段的工具。
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【判断题】数据库的设计应该与程序设计同时进行。
A. 对
B. 错
It seems the cattle on the sides of the dykes _________ the only living creatures in these desolate surroundings.
A. was
B. were
C. has
D. have
That green foliage_______restful.
A. was
B. were
C. has
D. have
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