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【单选题】
东北地区,多年生黑麦草在混播组合中常作为A.
保护草种
B.
建群草种
C.
伴生草种
D.
主要草种
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A.
resisted; hooked on
B.
accepted; addicted to
C.
distributed; involved in
D.
refused; devoted to
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A.
ca tsec1 sec2 chapter1
B.
cat sec1 sec2> chapter1
C.
comm sec 1sec2 chapter1
D.
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