皮皮学，免费搜题
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搜题
【单选题】
在分子生物学领域中，分子克隆主要是指
A.
DNA的大量复制
B.
DNA的大量剪切
C.
RNA的大量复制
D.
RNA的大量剪切
E.
RNA的大量转录
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举一反三
【单选题】He was so committed to the ______ of his faith that he was unable to evaluate them impartially.
A.
credits
B.
doctrines
C.
certificates
D.
documents
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【判断题】如果只把左边关系R中要舍弃的元组保留就叫做左外连接(LEFT OUTER JOIN或LEFT JOIN)。
A.
正确
B.
错误
查看完整题目与答案
【单选题】The term paper was due to December 1, but hard as he tried, he was unable to meet the _____ for it.
A.
challenge
B.
need
C.
deadline
D.
date
查看完整题目与答案
【单选题】He was unable to make much progress, hard ______ he tried.
A.
unless
B.
as
C.
however
D.
because
查看完整题目与答案
【简答题】左连接查询(LEFT JOIN 或 LEFT OUTER JOIN) (1)为文章表添加一条记录 (2)利用左外连接对文章表和栏目表进行查询
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【简答题】He is unable to answer the questions about the new text．He__________it yesterday．
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【单选题】左外连接查询中，主表在（     ）
A.
LEFT OUTER JOIN的左边
B.
LEFT OUTER JOIN的右边
C.
RIGHT OUTER JOIN的左边
D.
RIGHT OUTER JOIN的左边
查看完整题目与答案
【单选题】He was unable to make such progress, __________________.
A.
as he tried hard
B.
as hard he tried
C.
so hard did he try
D.
hard as he tried
查看完整题目与答案
【简答题】INNER JOIN代表___连接;LEFT OUTER JION代表___连接。
查看完整题目与答案
【单选题】Why is the woman unable to contact a colleague?
A.
He is at the office on Falcon Street.
B.
He is out of town.
C.
He has switched off his cell phone.
D.
He is in a discussion.
查看完整题目与答案
相关题目：
【单选题】He was so committed to the ______ of his faith that he was unable to evaluate them impartially.
A.
credits
B.
doctrines
C.
certificates
D.
documents
查看完整题目与答案
【判断题】如果只把左边关系R中要舍弃的元组保留就叫做左外连接(LEFT OUTER JOIN或LEFT JOIN)。
A.
正确
B.
错误
查看完整题目与答案
【单选题】The term paper was due to December 1, but hard as he tried, he was unable to meet the _____ for it.
A.
challenge
B.
need
C.
deadline
D.
date
查看完整题目与答案
【单选题】He was unable to make much progress, hard ______ he tried.
A.
unless
B.
as
C.
however
D.
because
查看完整题目与答案
【简答题】左连接查询(LEFT JOIN 或 LEFT OUTER JOIN) (1)为文章表添加一条记录 (2)利用左外连接对文章表和栏目表进行查询
查看完整题目与答案
【简答题】He is unable to answer the questions about the new text．He__________it yesterday．
查看完整题目与答案
【单选题】左外连接查询中，主表在（     ）
A.
LEFT OUTER JOIN的左边
B.
LEFT OUTER JOIN的右边
C.
RIGHT OUTER JOIN的左边
D.
RIGHT OUTER JOIN的左边
查看完整题目与答案
【单选题】He was unable to make such progress, __________________.
A.
as he tried hard
B.
as hard he tried
C.
so hard did he try
D.
hard as he tried
查看完整题目与答案
【简答题】INNER JOIN代表___连接;LEFT OUTER JION代表___连接。
查看完整题目与答案
【单选题】Why is the woman unable to contact a colleague?
A.
He is at the office on Falcon Street.
B.
He is out of town.
C.
He has switched off his cell phone.
D.
He is in a discussion.
查看完整题目与答案