题目内容

职工加入工会,由本人自愿申请,经()批准并发给会员证。

A. 上级工会
B. 上级党组织
C. 基层党组织
D. 工会基层委员会

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禁止在栏杆上、管道上、()、安全罩上或()行走和坐立。

“沐皇恩贾家延世泽”,贾家要复兴,靠的是哪个人物?()

A. 贾宝玉
B. 贾蓉
C. 贾琏
D. 贾兰

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)

简述硫化氢的化学性质?

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