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【单选题】
E-R模型属于A.
概念模型
B.
网状模型
C.
关系模型
D.
层次模型
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反馈参考答案：
举一反三
【简答题】Every hour and every minute ______ (be) precious.
【简答题】Choose the correct answer. 1) A day or two _____ enough. ( is / are) 2) His family ______ waiting for him. (is / are) 3) Neither you nor they _____ in fault. (is / are) 4) The po...
【简答题】完形填空。 Today the problem of environment has become more and more serious. Every day, every hour, the air, forests, soil, oceans and fresh 1 are becoming dirtier and dirtier. There are two 2 for the pro...
【简答题】Every hour and every minute (be) ______ important.
【单选题】_____ every passing hour and every shuffling step he got just a little bit closer to the race leaders.
A.
Up
B.
With
C.
On
D.
At
【简答题】写出下列牌号数字及文字的含 义 ( 1 'X 7 = 7 ' ) Q215—A F T20A Cr12MoV KTH300---06 45: 20CrMnTi:
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