在一定的试验条件下加热油品,当油品蒸气与空气所形成的混合气遇到明火时,发生闪火,此时油品的()为所测试油品的闪点。
A.温度
B.最低温度
C.最高温度
D.绝对温度
参考答案:B
______ the clothes are new, she has decided to give them away because they're too short for her. [ ]
A. And
B. But
C. Although
D. If
简述社会保障的功能和作用。