在相同的冷热流体进出口温度下,逆流布置的温差(),顺流布置温差()。
参考答案:最大;最小
_____, she is the sort of woman to spread sunshine to people through her smile. [ ]
A. Shy and cautious
B. Sensitive and thoughtful
C. Honest and confident
D. Lighthearted and optimistic
高分子特有的特征是单个高分子链也存在凝聚态。