A.油脂属于酯类
B.油脂密度比水小,不溶于水,会浮于水上层
C.油脂没有固定的熔沸点
D.油脂在酸性条件下的水解反应称为皂化反应
答案:D
用积分法计算图示梁的挠度,其边界条件和连续条件是()。
A.A
B.B
C.C
D.D
根据句意和提示写出单词。
1. I think _____ (d e c o m y) are very interesting.
2. They like Beijing Opera, but they don't like the _____ (t e n m u c d o r a y ).
3. He think the movie is _____ (o b i r n g).
4. I want to _____ (r e a l n) English.
5. It's a _____ (c e s s u c u f s l) movie.
6. Beijing Opera can help us learn Chinese _____(y s i h o r t).