视距测量时,经纬仪置于高程为162.382m的A点,仪器高为1.40m。上、中、下三丝读得立于B点的尺读数分别为1.019、1.400和1.781m,求得竖直角α=3°12′10″。则AB的水平距离和B点高程分别为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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