抽吸胎头吸引器内空气，使之成为负压，若无负压表，应抽多少空气（）。
A. 100ml
B. 150ml
C. 200ml
D. 250ml
E. 300ml
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经行身痛的发作与哪项有关（）
A. 与月经周期有关
B. 与月经周期无关
C. 与天气变化无关
D. 与天气变化有关
E. 以上都不对
剪纸中的人物、动物、花卉和景物除了正面形象外，通常多采用（）造型。
儒学文论“乐合同”中的“合同”指：使人们团结，也指艺术的（）功用。
You enable block change tracking. You issue the following command: BACKUP INCREMENTAL LEVEL 0 DATABASE; The next day, you issue the following command: BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE; Which statement about the use of the change tracking file is true?（）
A. RMAN reads the block change tracking file only when it performs the incremental level 0 backup.
B. RMAN reads the block change tracking file when it performs both incremental backups.
C. RMAN reads the block change tracking file only when it performs the incremental level 1 backup.
D. RMAN does not read the block change tracking file when it performs either incremental backup.
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