加油站应通过各种有效方式，提高加油员（收银员）的防伪鉴别能力。防止（）。
A. 开错发票
B. 加错油品
C. 收取假钞
D. 走单
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Which files are managed through the use of the file collection "HACMP_Files"？（）
A. The PowerHA Global OD
B. System networking files including /etc/hosts， /etc/inetd.conf and /etc/services
C. Security files including /etc/passwd， /etc/security/passwd， /etc/group and/etc/security/group
D. User configurable files including Application server start and stop scripts， custom pre and post notificationevents and application monitoring script
常用于高速场合的凸轮机构的从动件形式是（）
A. 平底从动件
B. 尖顶从动件
C. 滚子从动件
D. 曲面从动件
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