1：500～1：2000施工场地局部地形测量，其图幅为50cm350cm,一幅图内控制点数（解析图根点和测站点）应不小于8个。
参考答案：错
Mistakes don't just happen; they occur for a reason. Find out the reason, and then make the mistake
becomes _____. [ ]
A. favourable
B. precious
C. essential
D. worthwhile
铲钉检查时为安全起见，半个节点板内同时铲去钉头的铆钉数不得超过（）个。
A.2
B.3
C.4
D.5
