下列句子的主干谓语是________.Over 3，000 garages ownedby ten housing associations areunused and the land they take upisunfit for building homes upon．
A. owned& are
B. owned& is
C. are & take up
D. are & is
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下列句子中隐藏的从句是________.Over 3，000 garages owned by ten housing associations are unused and the land they take up is unfit for building homes upon．
A. appositive clause (同位语从句)
B. attributive clause (定语从句 )
C. object clause (宾语从句)
D. adverbial clause (状语从句)
测量的基本工作有( )。
A. 高程测量
B. 角度测量
C. 距离测量
D. 控制测量
E. 误差测量
测量工作的组织原则是
A. 由高级到低级
B. 从整体到局部
C. 由低级到高级
D. 先控制后碎部
E. 从局部到整体
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