一氧化碳冷凝时是（）过程。
A.吸热
B.放热
C.没有热量传递
D.不确定
参考答案：B
It's necessary for us to know some ways of __________the building when there is a fire. [ ]
A. coming up with
B. living in
C. escaping from
D. getting along with
（）属于二类传染病。
A、仔猪白痢
B、禽流感
C、猪急性胃肠炎
D、羊快疫
