机房专用空调的送风管道应设计、布放合理，气流组织、送风噪音等符合制冷设计要求，各送风口的（）、（）符合设备或系统的设计指标。
参考答案：风压；风量
先后成为古代中华文明象征的手工业产品是
A．铁器、瓷器
B．青铜器、铁器
C．丝绸、瓷器
D．麻布、丝绸
A. He didn’t have enough money left. B. He had some trouble with his lungs. C. He didn’t plan the trip very well. D. He was called back by a couple.
