下述心脏病很少引起肺淤血的为（）
A.风湿性心脏病二尖瓣狭窄
B.肺源性心脏病
C.高血压性心脏病
D.梅毒性心脏病
E.冠心病
参考答案：B
在清政府“海防”和“陆防”之争中，力主加强西北边疆的防御，并收复新疆的是（ ）
A．林则徐
B．李鸿章
C．左宗棠
D．郑成功
“Design of experiments” is a statistical method that helps （）.
A．determine how various elements of a system interrelate
B．identify which factors may influence specific variables of a product or process
C．establish a standard by which to measure performance
D．compare actual or planned project practices to those of other projects
