当电源系统发生声光告警时，如需要对告警声暂时进行屏蔽，可按如下操作：监控模块告警消音：监控模块告警时，按任一键（除复位键）即可消音。
参考答案：对
In Britain,sales of cigarettes have been reduced __________ 30% in the past ten years.
A．for
B．to
C．from
D．by
The house is ideal price but it is small.
A．in charge of
B．as a result of
C．in terms of
D．in exchange for
