In which three directories， relative to a web application’s root， may a tag library descriptor file reside when deployed directly into a web application？（）
A/WEB-INF
B/META-INF
C/WEB-INF/tlds
D/META-INF/tlds
EWEB-INF/resources
F/META-INF/resources
Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE You issue these statements: CREATE table new_emp ( employe_id NUMBER, name VARCGAR2(30)); INSERT INTO new_emp SELECT employee_id, last_name from employees; Savepoint s1; UPDATE new_emp set name = UPPER(name); Savepoint s2; Delete from new_emp; Rollback to s2; Delete from new_emp where employee_id=180; UPDATE new_emp set name = 'James'; Rollback to s2; UPDATE new_emp sey name = 'James' Where employee_id=180; Rollback; At the end of this transaction, what is true?（）
A、You have no rows in the table.
B、You have an employee with the name of James.
C、You cannot roll back to the same savepoint more than once.
D、Your last update fails to update any rows because employee ID 180 was already deleted.
设有关系歌手（歌手号姓名），根据“歌手”关系建立视图myview，视图中含有包括了“歌手号”左边第一位是“1”的所有记录，正确的SQL语句是（ ）。
A、CREATE VIEW myview AS SELECT*FROM歌手WHERE LEFT（歌手号，1）＝″1″
B、CREATE VIEW myview AS SELECT*FROM歌手WHERE LIKE（″1″，歌手号）
C、CREATE VIEW myview SELECT*FROM歌手WHERE LEFT（歌手号，1）＝″1″
D、CREATE VIEW myview SELECT* FROM歌手WHERE LIKE（″1″，歌手号）
房建施工图中，比例为（）的平面图、剖面图，可画简化材料图例，如（）等，但宜画出楼地面、屋面的面层线。
A、1：50～1：100砌体墙涂黑、钢筋混凝土涂红
B、1：50～1：100砌体墙涂红、钢筋混凝土涂黑
C、1：100～1：200砌体墙涂红、钢筋混凝土涂黑
D、1：100～1：200砌体墙涂黑、钢筋混凝土涂红
对话框由命令按钮组成。
A、对
B、错
绘制轴测剖视图的方法有先画（）再作剖视和先画断面形状，再画投影两种。
A、主视图
B、透视图
C、剖切面
D、外形