何谓“同时型产品开发”,它有什么突出优点?
下述疾病在传染过程中,表现为"显性感染多"的是 ["A.流感","B.麻疹","C.乙脑","D.白喉","E.脊髓灰质炎"]
下述各项中哪一项不符合戊型肝炎病毒特性 ["A.基因组为单股正链RNA","B.HEV直径为32~34mm","C.主要在肝细胞中复制","D.随胆汁入肠道经粪便排出","E.猴类对HEV不敏感"]
可以附寄回执的邮件有() ["A、普通邮件","B、挂号函件","C、普通包裹","D、特快邮件"]
女性,22岁,不洁饮食后出现眼黄、尿黄、乏力、纳差,如考虑急性甲型肝炎的诊断,则其不洁饮食应该在下列哪个时间段内才有流行病学意义 ["A.45天","B.30天","C.15天","D.3个月","E.6个月"]
简述新产品开发的主要组织形式