男性，57岁，因急性下壁心肌梗死入院。检查BP90／60mmHg，心率42次／分，律齐，最可能的心律失常是（）
A. 心房纤颤
B. 房性期前收缩
C. 室性心动过速
D. Ⅲ度房室传导阻滞
E. 完全右束支传导阻滞
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实行末位淘汰制可以从根本上调动员工的积极性。
A. 正确
B. 错误
为了防止尿样的腐败和器壁吸附微量元素，通常100mL尿液中加入多少毫升硝酸，以防上述情况发生（）。
A. 5mL
B. 4mL
C. 3mL
D. 2mL
E. 1mL
You backed up the control file to trace. Which statement is true about the trace file generated？（）
A. The trace file is in binary format.
B. The trace file has a SQL script to re-create the control file.
C. The trace file is a backup set created during the backup of the control file.
D. The trace file contains the instructions to manually re-create the control file.
E. The trace file is an image copy of the control file created during the backup of the control file.
(1).接触药物的溶剂可不断更新B (2).属于动态浸出 (3).适用于贵重和毒性药材提取 (4).一般不宜用水做溶剂
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