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【多选题】
农作物观测的作物种类和品种要求( )A.
观测作物要能代表当地主要种植制度的作物组合。
B.
观测作物的品种应是当地普遍推广或即将推广的优良的品种，品种更新换代，观测作物的品种也更换。
C.
观测作物应提前于当地普遍播种、移栽的时期播种、移栽。
D.
观测地段应记载作物的品种类型和大田栽培方式等。
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【简答题】对某边进行往返观测，得观测值分别为87.213m和87.226m，则观测结果为 m。
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B.
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D.
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improves
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was improved
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【简答题】对某边进行往返观测,得观测值分别为87.213m和87.226m,则观测结果为 ,相对误差为 。
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