环形炉烟气流动方向与炉底转动方向（）。
A.相同
B.相反
C.无关
D.不确定
参考答案：B
Mary is one of the brightest students who_________ from New York University.
A．is graduated
B．have graduated
C．has graduated
D．are graduated
左心房平均压的正常值
A．10～20mmHg
B．8～15mmHg
C．4～12mmHg
D．0～5mmHg
E．2～8mmHg
