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单选题
927. 每个探测器内的烟雾传感器监控高于预设限制的烟雾密度。如果密度保持高于限制大约8秒,则传感器设定探测器到警报状态。
A
The smoke sensor in each detector monitors when the smoke density is above a previous limit. If the density keeps higher than the limit for about eight seconds, the sensor set the detector to the alarm condition.
B
The smoke sensor in each detector monitors for smoke density above a preset limit. If the density stays above the limit for appropriately eight seconds, the sensor sets the detector to the alarm condition.
C
The smoke transducer monitors for smoke density above a presumed limit of each detector. If the density remains over the limit about eight seconds, the transducer turn the detector to the alarm condition.
答案解析
正确答案：B
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