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【多选题】
以下关于绵马贯众的性状特征,描述正确的有A.
表面黄棕色至黑褐色
B.
叶柄残基呈扁圆形,质硬而脆
C.
断面平坦,棕色,有黄白色维管束5~13个,U型排列
D.
密被排列整齐的叶柄残基及鳞片,并有弯曲的须根
E.
气特异,味微涩,后渐苦.
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A.
Schizophrenia
B.
Delusional disorder
C.
disorder, manic phase
D.
Schizoaffective disorder
E.
Schizophreniform disorder
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【多选题】化学降阻剂的基本原理（ ）
A.
降阻剂电阻远远小于接地电阻，分布周围相当于扩大了接地体直径
B.
降阻剂附着力强，消除接地体与土壤的接触电阻
C.
有些降阻剂吸水性保水性好
D.
降阻剂改变当地土壤性能
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