下列用于降血脂的药物是A．硝酸甘油B．桂利嗪C．洛伐他汀D．氨氯地平E．阿替洛尔

运输业基础设施的特性主要表现在()。

A.社会公益性

B.价值和使用价值特性

C.级差效益性

D.商品属性

E.纯粹的公 * * 品特性

已知x₁、x₂是关于x的方程（x-2）（x-m）=（p-2）（p-m）的两个实数根。

（1）求x₁、x₂的值；

（2）若x₁、x₂是某直角三角形的两直角边的长，问当实数m，p满足什么条件时，此时直角三角形的面积最大？并求出其最大值。

句型转换。（本大题共5小题，每小题1分，满分5分）

1. The boy had bread for his breakfast.(改为否定句)

The boy ___________  ______________ bread for breakfast.

2. People speak French in France.(改为被动语态)

French _________  ___________ in France.

3. “Mum, are you free now?” Kate said to her mother.(改为间接引语)

Kate asked her mother _________ she was free _________.

4. He is working hard at his lessons so that he can catch up with his classmates.(保持句意基本不变)

He is working hard at his lessons ____________ __________ to catch up with his classmates.

5. They had a very enjoyable trip.(改为感叹句)

_____________  _____________ enjoyable trip they had!

承受轴心荷载的构件称为受弯构件。

袋式过滤器滤袋堵塞的原因有哪些？