血栓形成性脑梗死和脑出血最具有鉴别意义的是（）
A.发病年龄
B.起病状态
C.起病速度
D.有无高血压病史
E.神经体征
参考答案：B, C
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
