多项选择题

下列两个指标之和为1的有
A、安全边际率与保本作业率
B、变动成本率与贡献毛益率
C、安全边际率与贡献毛益率
D、保本作业率与变动成本率

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单项选择题

患者男性，56岁。体检发现心尖部舒张期隆隆样杂音；胸片提示左房、右室增大，诊断为风心病二尖瓣狭窄。患者昨日无明显原因突然出现偏瘫、意识障碍，应考虑 A.脑血栓形成B.脑出血C.脑血管痉挛D.脑栓塞E.蛛网膜下隙出血

单项选择题

Which of the choices best translates the following sentence?
“目前的研究很少提供有关这项政策在农村地区如何实施的信息。”

A． Current studies provide little information on how this policy was implemented in rural areas.
B． Current studies provide little information on how this policy being implemented in rural areas.
C． Current studies provide little information on how was this policy implemented in rural areas.
D． Current studies provide little information on how this policy implemented in rural areas.