水、电、气三基表电脉冲信号由数据采集器再由总线传输到物管中心微机。
参考答案：错
---Kate won the drawing competition yesterday. It was so cool!
---- Yes. She spend all her free time _____ drawing.
A．keep on
B．keep practicing
C．in keeping on
D．on keeping practicing
经调查甲、乙两市的冠心病粗死亡率为 45/10万，按标准人群年龄构成标化后，甲市标化率为52/10万，乙市为 40/10万，故可认为
A．甲市年龄别人口构成较乙市年轻
B．甲市年龄别人口构成较乙市老化
C．甲市冠心病诊断较乙市准确
D．乙市冠心病诊断较甲市准确
E．甲乙市冠心病患病率差别有统计学意义
