．我国对旅游饭店星级的评定，采取按星级饭店的与相结合办法综合评定。
参考答案：必备条件、检查评分
0ne of the limitations of foam as an extinguishing agent is that foam（）.
A.cannot be made with salt water
B.is heavierthan oil and sinks below its surface
C.is corrosive and to fire fighters
D.conducts electricity
