减压塔底液面偏高时，正确的处理方法是（）。
A．开大减底泵出口阀
B．关小减底泵出口阀
C．加大减压炉迸料量
D．降低减压炉进料量
参考答案：A
They bring gifts ___________ us on Christmas. [ ]
A. at
B. on
C. to
D. for
As part of monitoring and controlling, project performance must be monitored and measured regularly to identify variances from the plan. All the following are processes involved with controlling EXCEPT （）.
A．verify scope
B．risk monitoring and control
C．performance reporting
D．quality assurance
