患者男性，62岁，咳嗽，咳痰20年，有高血压、肝炎病史。查体：BP150/83mmHg，肺肝界位于第六肋间。心界缩小，心率110次/分，律不齐，P亢进，胸骨左缘第五肋间可闻及收缩期杂音。肝肋下3.5cm，双下肢水肿。心电图报告：顺钟向转位，V，V呈QS型。为进一步明确诊断，检查首选()
A. X线胸片
B. 腹部B超
C. 肺功能检查
D. 支气管镜检查
E. 痰细菌培养
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患者男性，38岁，工人，因“摔伤左足跟部，肿痛、畸形、活动受限1天”来诊。患者1天前干活时从约3米高处摔下，致伤左足跟部，当时意识清，无昏迷、呕吐史，左足跟部肿痛，活动受限，未做治疗，疼痛不减。由跟骨外侧沟底向前结节最高点连线与后关节面线之夹角是（）
A. 跟骨结节关节角
Bolher角
C. 跟骨交叉角
D. 跟骨关节角
E. 提携角
The STUDENT_GRADES table has these columns: STUDENT_ID NUMBER(12) SEMESTER_END DATE GPA NUMBER(4,3) The registrar has asked for a report on the average grade point average (GPA) for students enrolled during semesters that end in the year 2000. Which statement accomplish this? （）
A. SELECT AVERAGE(gpa) FROM student_grades WHERE semester _ end > '01-JAN-2000' and semester end <31-DEC-2000';
B. SELECT COUNT(gpa) FROM student grades WHERE semester _ end > '01-JAN-2000' and semester end <31-DEC-2000';
C. SELECT MIN(gpa) FROM student grades WHERE semester _ end > '01-JAN-2000' and semester end <31-DEC-2000';
D. SELECT AVG(gpa) FROM student_grades WHERE semester _ end BETWEEN '01-JAN-2000' and '31-DEC-2000';
E. SELECT SUM(gpa) FROM student grades WHERE semester _ end > '01-JAN-2000' and semester end <31-DEC-2000';
F. SELECT MEDIAN(gpa) FROM student_grades WHERE semester _ end > '01-JAN-2000' and semester end <31-DEC-2000'
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