自顶向下规划的目标是达到信息的一致性，即保证下列哪些内容的一致？
Ⅰ．数据字段定义
Ⅱ．数据结
Ⅲ．更新时
Ⅳ．更新规划
Ⅳ．数据记录
A. Ⅰ和Ⅱ
B. Ⅰ，Ⅱ和Ⅲ
C. Ⅰ，Ⅲ和Ⅴ
D. 全部
查看答案
The sentence "we pay for our sentitivity" in Para. 2 most probably means ______.
A. we suffer because of being sensitive
B. our sensitivity costs us a great deal
C. we have to pay the dentist for his making us sensitive to pain
D. we are lucky to have developed our senses
A．He's reading a book.B．He's a company manager.C．He's very well.D．He's about 30.
A. He's reading a book.
B. He's a company manager.
C. He's very well.
D. He's about 30.
选用于最后孤立，并向近中舌向倾斜的下颌磨牙的卡环是
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