在定性的基础上，依据开发需求确定注水井及每个层段配注水量就称为（）注水。
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网上单证的哪些元素需要统一的风格（）
A. 色彩
B. 链接
C. 字体
D. 字形
Which two statements about subqueries are true? （）
A single row subquery can retrieve data from only one table.
B. A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.
C. A SQL query statement can display data from table B that is referred to in its subquery, without including B in its own FROM clause.
D. A single row subquery can retrieve data from more than one table.
E. A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.
F. A multiple-row subquery cannot be used in an INSERT statement to insert multiple rows at a time.
DFA可以通过多条路径识别一个符号串。
A. 正确
B. 错误
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