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磁性材料产品中的层裂是因为（）引起的。

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大型群众性活动应当在活动前（）h内进行防火检查。

A. 2
B. 4
C. 10
D. 12

The STUDENT_GRADES table has these columns: STUDENT_ID NUMBER(12) SEMESTER_END DATE GPA NUMBER(4,3) The register has requested a report listing the students' grade point averages (GPA), sorted from highest grade point average to lowest within each semester, starting from the earliest date. Which statement accomplishes this?（）

A. SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester_end DESC, gpa DESC;
B. SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester _end, ASC,gpa ASC;
C. SELECT student_id, semester_end, gpa FROM student_grades ORDER BY semester _end, gpa DESC;
D. SELECT student_id, semester_end, gpa FROM student_grades ORDER BY gpa DESC,semester_end DESC;
E. SELECT student_id, semester_end, gpa FROM student_grade

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需依赖HBV感染，与HBV同时感染或在乙型病毒性肝炎基础上重叠感染的是（）

A. 甲型病毒性肝炎
B. 乙型病毒性肝炎
C. 丙型病毒性肝炎
D. 丁型病毒性肝炎
E. 戊型病毒性肝炎

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除了婚姻法，亲属关系在其他民事法律上的效力有哪些？试举例说明。

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