进行水准测量时,采用前后视距相等,可消除()误差。
A.地球曲率
B.大气折光
C.竖轴与圆水准器轴不平行
D.视准轴不平行水准管轴
参考答案:A, B, D
“I called you yesterday. A woman answered, but I didn’t recognize her voice.” “Oh, it _____ my aunt Jean.”
A.must be
B.must have been
C.might be
D.can have been
( )是领队的职权,地陪在核对接待计划和商定节目安排的时候,对此应了解并尊重。
A.安排好该团在当地的活动日程
B.希望得到他国(地)导游人员的尊重和协助
C.商定日程并宣布日程
D.对旅游者的尊重和礼遇