用戶【ina97552500】點評問題和點評內容

【評論主題】3. Sarah ______ Marian’s help. She is thankful for her assistance.(A) obtains (B) endures (C) motiva

【評論內容】

obtain (v) 獲得,達到

endures (v) 忍受,忍耐

motivate (v) 激勵,激發

appreciate (v) 欣賞,感謝

【評論主題】1. In the literary history of the world, two of the greatest love stories have always been very popu

【評論內容】

intertwining 糾纏

influential 影響

 arguable 有爭議的

sensible 通勤達理的

【評論主題】6. Due to nervousness, he sweated _____ and needed to change his shirt during the event.(A) mentally

【評論內容】

mentally 精神上

excessively 過多地

unwillingly 不情願地

accurately 準確地

sweated 出汗

【評論主題】4. The artist often draws _____ from ordinary scenes. He pays close attention to his surroundings an

【評論內容】

toxin 毒素,毒質 

mechanism 機器零件

detraction 毀謗,毀損

inspiration 靈感,鼓舞

【評論主題】41.下列哪些是關聯式資料模型的完整性限制(integrity constraint)?(A)領域限制(domain constraint) (B)正規化(normalization)(C)個體完整性

【評論內容】

1.鍵值限制規則(Key constraint):關聯式中的候選鍵的值在任何值組中必須是唯一的。

2.實體整合規則(Entity integrity rule):基本關聯式的主鍵屬性中任何一個元素不可以是空值(null)。

3.參照整合規則(Referential integrity rule):資料庫中不能包含不能相配的外鍵值,也就是說,若B參照A,則A必須存在。

4.定義域限制(Domain constraint):資料庫裡每一個關聯的每一筆值組(tuple)的每一屬性值必須是該屬性定義域裡的單一值。