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【单选题】
正常心尖搏动的位置是（ ）A.
心尖搏动位置向外上移位
B.
心尖搏动向移位
C.
心尖搏动向左侧移位
D.
心尖搏动移向患侧
E.
心尖搏动位于左锁骨中线内0.5～1．0cm
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举一反三
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【单选题】RBC Corporation currently has a negative contribution margin. Which of the following statements is true?
A.
It can break even by increasing its sales volume.
B.
It can achieve a positive operating profit by reducing its fixed costs.
C.
It can improve profits by decreasing its variable cost per unit.
D.
It can improve profits by decreasing its selling price.