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【单选题】
血液离心后,最靠近血浆层的细胞是A.
带氧红细胞
B.
白细胞
C.
血小板
D.
有核红细胞
E.
还原红细胞
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】链传动中，当节距P增大时，优点是（），缺点是（）
【单选题】(Let's not) waste time on matters (of no important). We have other (vital) problems to (deal with).
A.
Let's not
B.
of no important
C.
vital
D.
deal with
【单选题】(Let's) not waste time on (matters of no important). We have other (vital) problems to (deal with).
A.
Let's
B.
matters of no important
C.
vital
D.
deal with
【单选题】(Let's not) waste lime on (matters of no important). We have other (vital) problems to (deal with).
A.
Let's not
B.
matters of no important
C.
vital
D.
deal with
【单选题】By 'critical times' (para. 2) the author means ______.
A.
important stages in the child's development
B.
difficult periods in the child's life
C.
times when mothers often neglect their children
D.
moments when the child becomes critical towards its mother
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