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根据左面的形位公差符号写出形位公差的名称

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书面表达
Christopher Columbus
Year of Birth1451
Place of OriginGenoa ,Italy
Education BackgroundLearn by himself
Jobs TakenHelp his father
DreamsTo be rich and famous
At 41,leave Spain and sail toward the west In  1492 ,discover America
       英语课上,老师要求你们根据表格内容，写一篇介绍哥伦布生平的作文。
       要求：1．语句通顺、语法正确；
                   2．70词左右。
                                                                                                                                                                
                                                                                                                                                                
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单项选择题 A1/A2型题

乙肝疫苗主要成分是哪种（）

A.HBsAg

B.HBcAg

C.HBeAg

D.HBV-DNA聚合酶

E.Dane颗粒
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