油品闪点测定法之所以要分成闭口杯法和开口杯法，主要决定于油品的（）和（）。
参考答案：性质；使用条件
完成对话，每空一词
Mother: Kate! It’s late. Why are you still in bed? You must get up and get ready for 小题1: . If you don’t go soon, you’ll be late.
Kate: I don’t 小题2: very well.
Mother: Oh dear! What’s wrong?
Kate: I don’t _小题3: . My head hurts.
Mother: Really? If you are _小题4: , you’ll have to_小题5: the doctor.
Kate: Can I have some breakfast first?
Mother: No, you小题6: eat anything until you see the doctor.
Kate: Mom, I feel a little __小题7: now.
水泥路面保洁的作用（）
A、以免应车辆碾压破坏路表。
B、防止泥、沙土挤进接缝内
C、影响板的正常伸缩
D、影响路容路貌
