劳动合同自用人单位与劳动者在劳动合同文本上（）生效。
A. 签字
B. 盖章
C. 签字和盖章
D. 签字或者盖章
For which two situations would you use functionality provided by the Resource Manager?（）
A. setting idle timeout limits on resource plans
B. saving storage space by using compressed backup sets
C. creating jobs that will run automatically at a scheduled time
D. assigning priorities to jobs to manage access to system resources
E. creating alerts to perform notification when tablespaces are low on available space resource
堤防工程中的堤身用机带碾磙或振动碾压实时，碾迹搭压宽度应大于（）cm。
A. 5
B. 10
C. 15
D. 20
SH/T0713汽油中苯及甲苯含量气相色谱法中确定反吹时间所使用的溶液为（）。
A. 异戊烷＋正壬烷
B. 正庚烷＋正癸烷
C. 正辛烷＋正壬烷
D. 异辛烷＋正壬烷
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