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遇异物侵入列车接近限界影响列车正常运行时站区各级人员应做哪些工作？

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机械运转速度的波动分为哪些？

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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

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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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