[多选]
Examine the description of the MARKS table:
STD_ID NUMBER(4)
STUDENT_NAME VARCHAR2(30)
SUBJ1 NUMBER(3)
SUBJ2 NUMBER(3)
SUBJ3 NUMBER(3)
SUBJ1, SUBJ2, and SUBJ3 indicate the marks (grades) obtained by a student in the three subjects. Which two statements are valid? （）

A . SELECT SUM(subj1, subj2, subj3) FROM marks;
B . SELECT SUM(subj1 + subj2 + subj3) FROM marks;
C . SELECT SUM(subj1), SUM(subj2), SUM(subj3) FROM marks;
D . SELECT MAX(subj1, subj2, subj3) FROM marks;
E . SELECT MINIMUM(subj1) FROM marks;
F . SELECT COUNT(std_id) FROM marks WHERE subj1 >= AVG(subj1)

教师用红笔批改作业，这是运用知觉的（）整体性。恒常性。选择性。理解性。根据《公路工程设计变更管理办法》，属于较大设计变更的是（）发生变化的。特大桥的数量或结构型式。分离式立交的数量。特长隧道的数量或通风方案。互通式立交的数量。区域部门化具有以下特点（）各地区分管部门可以及时针对区域的实际情况迅速作出反应，调整政策和策略。有利于培养具有通盘领导能力的综合管理人员。难以物色在地区担负“首脑”职责的人才。可能增加管理成本，造成地区管理和总部管理之间某些管理职能的重复。在地区和总部之间两级管理的集权与分权关系不易处理。不属于侵犯专利权的行为有哪些？火灾的发生要有三个条件，即通常所说的燃烧三要素是什么？（）煤炭。氧气。热源。可燃物。

Examine the description of the MARKS table:
STD_ID NUMBER(4)
STUDENT_NAME VARCHAR2(30)
SUBJ1 NUMBER(3)
SUBJ2 NUMBER(3)
SUBJ3 NUMBER(3)
SUBJ1, SUBJ2, and SUBJ3 indicate the marks (grades) obtained by a student in the three subjects. Which two statements are valid? （）

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[多选] Examine the description of the MARKS table: STD_ID NUMBER(4) STUDENT_NAME VARCHAR2(30) SUBJ1 NUMBER(3) SUBJ2 NUMBER(3) SUBJ3 NUMBER(3) SUBJ1, SUBJ2, and SUBJ3 indicate the marks (grades) obtained by a student in the three subjects. Which two statements are valid? （）

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[多选]
Examine the description of the MARKS table:
STD_ID NUMBER(4)
STUDENT_NAME VARCHAR2(30)
SUBJ1 NUMBER(3)
SUBJ2 NUMBER(3)
SUBJ3 NUMBER(3)
SUBJ1, SUBJ2, and SUBJ3 indicate the marks (grades) obtained by a student in the three subjects. Which two statements are valid? （）