闭和导线的纵横坐标增量之和理论上应为______,但由于有误差存在,实际不为______,应为______。
导线测量角度闭合差的调整方法是________。
— ___________________
— Once or twice a week.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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