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【多选题】
下列关于的表述正确的是( )。A.
保本销售量是企业最低销售量，保利销售量是企业最高销售量
B.
是在单价和成本水平不变的情况下，为确保目标利润能够实现的销售量和销售额
C.
单一品种的有保利销售量和保利销售额两种表达形式
D.
多品种的只能用综合保利销售额来表示
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【单选题】He should________his attention________the main problems. [ ]
A.
aim; with
B.
pay; on
C.
focus; on
D.
concentrate; with
【简答题】阅读理解。 By far the most common difficulty in study is failure to get down to regular concentrated work.This difficulty is much greater for those who do not work to a plan and have no regular rout...
【简答题】表达式语句由( )+( )构成;表达式由( )和( )组成。
【单选题】The new teacher was very quick to _________ the rules of the schoolA．adapt toB．addict toC．concen
A.
27. The new teacher was very quick to _________ the rules of the school A．adapt to
B.
addict to
C.
concentrate on
D.
depend on
【单选题】The greatest danger is fatigue at the wheel. Some music can ________ you into concentration loss.
A.
contribute
B.
lull
C.
cause
D.
conduce
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