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【单选题】
存在于不同种系生物之间的共同抗原称为A.
共同抗原
B.
异嗜性抗原
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参考解析：
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皮皮学刷刷变学霸
举一反三
【多选题】Which two statements about creating constraints are true?（）
A.
Constraint names must start with SYS_C
B.
All constraints must be defines at the column level.
C.
Constraints can be created after the table is created.
D.
Constraints can be created at the same time the table is created.
E.
Information about constraints is found in the VIEW_CONSTRAINTS dictionary view.
【简答题】案例: 患者,女性,16岁。因发热、间歇性上下肢关节疼痛3个月余就诊.体格检查:体温38.5°C,贫血貌,轻度黄疸,肝、脾略肿大。实验室检查:血红蛋白80g/L,血细胞比容9.5%,红细胞总数3×10e14/L,白细,胞总数6×10e9/L,白细胞分类正常。网织红细胞计数0.12;次亚硫酸氢钠试验阳性;Hb电泳产生一条带,所带正电荷较正常 HbA多,与 HbS同一部位.红细胞形态:镰型.患者呈现明...
【多选题】Which two benefits are provided by creating VLANs?（）
A.
added security
B.
dedicated bandwidth
C.
provides segmentation
D.
allows switches to route traffic between subinterfaces
E.
contains collisions
【多选题】The blade has a groove on the bottom creating two distinct edges ——__________ and ___________.
A.
inside
B.
upside
C.
outside
D.
downside
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