肺淤血的常见原因是（）
A.右心衰竭
B.左心衰竭
C.肝功能衰竭
D.肾功能衰竭
E.脾功能衰竭
参考答案：B
A project was expected to cost $6 million for 3 months. At the end of 1 month, you use earned value as a performance management tool and get the following information: BCWP=$1.5 million, BCWS=$2.5 million, ACWP=$2.2.million. What is the schedule variance ？（）
A．$0.3 millio
B．$-1 millio
C．$1 million。
D．$0.7 millio
简述残疾人体育活动的社会意义。
