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【简答题】
简述马铃薯病毒病的综合防治措施。
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】When a space shuttle has accomplished its _____, it can be ready for another trip in about two weeks.
A.
venture
B.
mission
C.
commission
D.
responsibility
【多选题】According to the professor, what are two problems that can be anticipated when roads are cut into an area for mining? Click on 2 answer choices.
A.
The labor is difficult to retain.
B.
The natural landscape is damaged.
C.
The roadbeds create waste piles.
D.
The ecosystem is disturbed.
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