计算题:假设现测得一铜管外径任意四点分别为7.06mm,7.03mm,6.96mm,6.99mm,请计算出该铜管的平均外径?
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某供电公司线路运行人员2011年4月9日巡线时,发现583线路正线5号杆倾斜,需要紧急停电处理,9:00向调度提出申请,9:20调度批准,9:30拉开583馈线开关进行处理,11:45处理完毕,送电正常。在选择停电状态时应选择“()”。
A、B、C三相母线的相色分别规定为()。
A. 红绿黄
B. 黄红绿
C. 黄绿红
D. 红黄绿
Language is p()in that it makes possible the construction and interpretation of new signals by its users. In other words, they can produce and understand an infinitely large number of sentences which they have never heard before.