【单选题】【消耗次数：1】
沉降观测时水准基点和观测点之间的距离一般应在米范围内，一般沉降点是均匀布置的，距离一般为米。
①
A、80、5~10
②
B、80、10~20
③
C、100、5~10
④
D、100、10~20
参考答案：
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G02X20Y20R-10F100；所加工的一般是（）。
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整圆
②
夹角180°的顺时针圆弧
③
180o〈夹角〈360°的逆时针圆弧
④
180o〈夹角〈360°的顺时针圆弧
【单选题】
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①
Normal
0
7.8 磅
0
2
false
false
false
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ZH-CN
X-NONE
A与D，D点可见
②
Normal
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0
2
false
false
false
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ZH-CN
X-NONE
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B与C，B点可见
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Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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false
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(15，30，35)
②
( 30,20,15)
③
( 15，20，30)
④
( 10,20,5)
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ZH-CN
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false
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