【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
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夹角180°的顺时针圆弧
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180o〈夹角〈360°的逆时针圆弧
④
180o〈夹角〈360°的顺时针圆弧
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(15，30，35)
②
( 30,20,15)
③
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④
( 10,20,5)
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