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【单选题】
小麦中期的主攻目标是( )。A.
适期播种争四苗，消灭三籽出齐苗，促根促蘖培壮苗，安全越冬奠基础。
B.
协调地上与地下、器官与器官之间的关系，实现穗大粒多、壮秆不倒。
C.
保持根系和叶片的正常功能，防病虫、防干热风、防渍害，实现増重的目标。
D.
灌溉、中耕、多施肥。
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