体弱者和病后康复者锻炼时应控制运动强度，但要坚持较长时间。
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机车牵引电机的供电方式可分为集中供电、半集中供电及（）等方式。
LKJ2000数字量输入/输出插件板1B灯“亮”表示含义是（）。
A. 接收机车工况向后位（XH）信号
B. 接收机车工况向前位（XQ）信号
C. 接收机车工况牵引位（QY）信号
D. 接收机车工况制动位（ZD）信号
下列企业发展评价指标中，（）在小企业发展过程中呈较快增加的趋势
A. 员工数量
B. 销售额
C. 资产规模
D. 进入障碍
E. 竞争能力
You executed the following command in Recovery Manager （RMAN）： RMAN> REPORT NEED BACKUP days 3； What is the output of this command？（）
A. a list of files that require a backup within three days
B. a list of files requiring more than 3 days of archive logs to apply
C. a list of files that RMAN recommends be backed up only once in every three days，based on low volatility
D. a list of files for which a backup has already been performed in the last three days and which is required to be backed up again based on the high number of transactions performed on them
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