通气／血流比值失调常见于（）
A.肺栓塞
B.呼吸窘迫综合征
C.肺水肿
D.肺炎
E.肺不张
参考答案：A, B, C, D, E
针对内部专卖管理监督的重点，内管人员需要从财务环节查询的主要内容是卷烟、雪茄烟生产经营企业的（）。
A、利润情况和费用情况
B、税收情况和费用情况
C、成本核算情况和往来货款结算情况
D、利润情况和销售收入
An analyst obtains statistics on return information for Vay Industries and Ranch Meatpacking as follows:
Based on this information, what is the covariance between the two sets of returns, and what is the correlation coefficient Covariance Correlation coefficient()①A. 5.98 0.32
②B. 5.98 0.42
③C. 6.52 0.32
A．①
B．②
C．③
Based on this information, what is the covariance between the two sets of returns, and what is the correlation coefficient Covariance Correlation coefficient()①A. 5.98 0.32