P 点的高程为由已知高程的 A 、 B 、 C 三点用三角高程测量求得。试计算 P 点的高程值。起算数据见下表。 测站名 高 程 /m 至 P 点的距离 /m A 50.48 1142.36 B 133.94 974.27 C 120.57 1038.84 观测数据见下表: 测站 目标 竖 角 仪器高 /m 目标高 /m A P +3°13′20′′ 1.46 2.50 B P -1°06′40′′ 1.52 2.50 C P -0°18′30′′ 1.48 2.50
【简答题】As the new nation formed, it was the Protestant branch of the ________ faith that had the strongest effect on the development of the religious climate in the United States.
【简答题】Immigration into America started in the 1600s and continued nonstop and unrestricted until the late 1800s. Since the United States was a new nation with a massive frontier and very few people to shape...
【简答题】The Republic of Vanuatu is an island nation located in the South Pacific Ocean. It was one of the poorest nations in the region. Within the last five years, however, it has become a hot spot for adven...