5.水平角测量中,哪项误差不能用盘左盘右取平均值的观测方法消除( )。
A. 照准部偏心差
B. 整平误差
C. 视准轴误差
D. 横轴误差
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2.在进行竖直角观测时,若瞄准的是与目标在同一水平面的其他点,则所测竖直角的结果与实际上的角值相比( )
A. 增大
B. 减小
C. 不变
D. 不确定
4.由水准尺不直立、水准仪下沉、尺垫下沉所产生的误差性质( )
A. 系统误差、系统误差、系统误差
B. 偶然误差、系统误差、偶然误差
C. 偶然误差、偶然误差、系统误差
D. 系统误差、系统误差、偶然误差
7.对三角形进行5次等精度观测,其真误差(闭合差)为:+4″;-3″;+1″;-2″;+6″,则该组观测值的精度( )
A. 不相等;
B. 相等;
C. 最高为+1″
D. 无法计算
Why did the waiter Somsak say "special place for special people" to Miss Stewart?
A. Because Miss Stewart often come to the cafe, so he knows her well.
Because he saw Miss Stewart came in with a friend,so he creat a welcome atmosphere.
C. Because Miss Stewart hadn't been to to the cafe for a long time.
D. Because Miss Stewart often make special order cakes there.
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