假設push X代表將資料X壓入堆疊中,pop代表從堆疊取出資料,請問一個空堆疊(Empty Stack)經過下列步驟順序,何者最後一個pop出來的會是B?
(A)push A, pop, push B, pop, push C, pop (B)push A, push B, pop, pop, push C, pop
(C)push A, pop, push B, push C, pop, pop (D)push A, push B, push C, pop, pop, pop
34 下列 SQL 語法目的是對一個資料表 Book 作查詢,但是該 SQL 語法有錯誤,請問該語法缺少那一個子句?
SELECT title, author, year WHERE year > 2010; (A) FROM Book (B) BASED on Book (C) ORDER by Book (D) GROUP by Book