单项选择题

如果测区附近无高级控制点，则应用()测定导线起始边的磁方位角

A、经纬仪
B、罗盘仪
C、水准器
D、以上都对

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It is known from the first paragraph that
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A.crying
B.
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C.
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单项选择题

产品生产和流通中，将产品或服务提供给最终用户活动涉及的上游与下游企业所形成的网链结构，称为()。

A.销售网络
B.生产网络
C.供应链
D.产品网络