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
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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
临床上称作卢滕巴赫（Lutembacher）综合征的先天性心脏病是房间隔缺损（二孔型）合并下列哪种疾病（）
A. 二尖瓣关闭不全
B. 肺动脉狭窄
C. 肺静脉畸形引流
D. 左上腔静脉畸形发展
E. 二尖瓣狭窄
如果当前图像文件为RGB色彩模式，按（）键可以快速预览RGB色彩模式图像在CMKY状态下的颜色显示效果。
A. Ctrl+Y
B. Ctrl+M
C. Alt+Y
D. Shif+Y
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