在未来的农业生产中，依托于地理信息技术，农民首先可定期获得农田长势的影像资料，再经过系统分析，最后把杀虫剂、化肥施用到最需要的农田，从而减少污染、提高产量(如下图)。这一过程中，依次使用的技术是
| A．GPS—RS—GIS | B．RS—GPS—GIS |
| C．GIS—RS—GPS | D．RS—GIS—GPS |
相关试题
It’s not easy for the expert to ______ pig flu.in humans from regular human seasonal influenza.
| A．distinguish | B．separate | C．identify | D．recognize |
Premier Wen Jiabao said that if we worked hard and____ optimistic,we were_____ win the war against the finanical crisis.
| A．were; bounding | B．were; bound to | C．was; bounding to | D．had; bounded to |
Single-parent usually____ some of the functions that absent adult in the house would have served under the financial crisis.
| A．takes over | B．takes after | C．takes out | D．takes in |
He was unaware of the financial crisis involed, so his choice was quite_____.
| A．rational | B．arbitrary | C．mechanical | D．predictable |
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