侧向水平荷载
参考答案：
与水平管道轴线方向成侧向垂直的荷载，包括风荷载、弯曲管道或支管传来的推力、管道侧向位移产生的摩擦力等。
-Which of these English CDs do you think I should buy, sir?
-__________ You're supposed to have ideas of your own.[ ]
A. It's up to you.
B. That's settled.
C. With pleasure.
D. I've got that.
随着古代文明的衰落，中世纪欧洲科学史在探索的形式、对象、内容和成果上都是以（）为中心展开的。
A、政治
B、神学
C、法律
D、经济
