锅炉主要运行参数是（）锅炉蒸发量等。
A.蒸汽压力
B.过热蒸汽温度
C.再热蒸汽温度
D.汽包水位
参考答案：A, B, C, D
-I remember you were a talented pianist at college. Can you play the piano for me?
- Sorry, I the piano for years.
A．don't play
B．wasn't playing
C．haven't played
D．hadn't played
MEN2B中的MCT为家族性病例的特点有以下哪几项（）
A.病情最重
B.发生最早
C.病情最轻
D.进展最快
E.发生最晚
