启动补氨泵首先启动变频器，确认变频器无故障状态；启动电机；根据PH值进行变频调速或手动调速。
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患者女，27岁。左上第一磨牙深龋，去腐质后未穿髓，垫底作银汞合金充填，最适合的垫底材料是（）
A. 聚羧酸锌粘同粉
B. 磷酸锌粘固粉
C. 氧化锌丁香油粘固粉
D. EDTA
E. 氢氧化钙
男性，20岁，误服有机磷农药，瞳孔缩小、面肌颤动、呼吸有大蒜味，最好选用哪种溶液来洗胃（）。
A. 1﹕5000高锰酸钾液
B. 硫酸酮溶液
C. NaHCO3水
D. 生理盐水
E. 清水
Which of the following restrictions are not true with respect to tablespace point-in-time recovery？（）
A. The target database must be in NOARCHIVELOG mode.
B. No backup is required of the database before you perform a TSPIT
C. You must have all archived redo logs generated since the last backup up to the point to which you want to restore the transport set.
D. If you rename a tablespace， you can not perform a TSPITR to any point in time before that rename operation occurred.
E. If you have tables in tablespace_1 that have associated constraints in tablespace_2，then you must transport both tablespaces.
中、重度吸入性损伤及大面积深度烧伤、重度休克等合并呼吸困难的患者，保证气道通畅的最佳方法()
A. 气管插管
B. 气管切开造口
C. 气管插入大针头
D. 咽导管
E. 面罩
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