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【单选题】
若圆锥的底面半径为3cm，母线长为6cm，则圆锥的侧面积为（ ）A.
36πcm 2
B.
27πcm 2
C.
18πcm 2
D.
9πcm 2
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举一反三
【单选题】下列哪项不是未成熟DC的特点
A.
表达高水平模式识别受体
B.
识别和摄取外源性抗原的能力较强
C.
加工抗原能力较强
D.
低水平表达MHC II类分子和共刺激分子、黏附分子
E.
提呈抗原和激发免疫应答的能力较强
【多选题】What has contributed to Oprah’s success?
A.
Her persistence.
B.
Her determination.
C.
Her father’s education.
D.
Her courage when confronting difficulties.
【单选题】What has contributed much to America's lack of qualified skilled workers?
A.
The outdated education system.
B.
The current new classification of workforce.
C.
The fact that most American workers are illiterates.
D.
The fact that the blue-collar workers are not used to the factory work.
【简答题】交流电的周期是指 ,用字母 表示,单位是 ;频率是指 ,用字母 表示,单位是 ;周期与频率之间的关系是 ;角频率是指 ,用字母 表示,单位是 。
【简答题】交流电的周期用字母____表示,单位是____。
【多选题】What has contributed to AR's increasing success?
A.
Complex technological advances.
B.
Meaningful content.
C.
Convincing and realistic interaction of the virtual with the physical environment.
D.
Unique value that goes beyond what other technologies deliver
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