三角高程测量中，采用对向观测可以消除（）的影响。
A视差
B视准轴误差
C地球曲率差和大气折光差
D水平度盘分划误差
参考答案：C
It was in the Lake District _______ the poet William Wordsworth spent much of his lifetime.
A．how
B．that
C．which
D．where
甲醇洗循环气压缩机入口分离器设有液位“高高”和“低低”联锁。
