【单选题】每曰动物性食物肉、禽、蛋、鱼及水产品,应占全天食物总量的 ( )。
【单选题】category表中有一条数据是cid=1,cname=数码产品,在product表中有2条数据的cid=1,如果执行 select * from category join product on category.cid=product.cid,那么会查询出来多少条数据
【单选题】B. Listen to the dialogues again and select the correct answers. 1. As for a new product or service, we should first solve the problem of _________.
B.
who our potential customers are
C.
how to conduct a research
D.
who our competitors are
【单选题】城乡规划法所称城乡规划,包括什么(2009,74)
D.
城镇体系规划、城市规划、镇规划、乡规划和村庄规划
【单选题】A SELECT statement can be used to perform these three functions: 1.Choose rows from a table. 2.Choose columns from a table. 3.Bring together data that is stored in different tables by creating a link ...
A.
difference, projection, join
B.
selection, projection, join
C.
selection, intersection, join
D.
intersection, projection, join
E.
difference, projection, product
【简答题】Read the following text, and identify words that illustrate sequence/time order. How does shopping on Web Site work? Shopping on our web site occurs in the following easy steps: Step 1: Select product...
【单选题】R 为水准点, R H =15.670m,A 为建筑物室内地坪 ± 0 待测点, 设计高程 A H =15.820m, 若后视读数 1.050m, 那么 A 点水准尺读数 为( )时,尺底就是设计高程 A H 。