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【单选题】
股票在流通市场上买卖的价格是( )。A.
发行价格
B.
股票市价
C.
清算价值
D.
内在价值
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皮皮学刷刷变学霸
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【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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