扑灭醇类、酮类物质发生的火灾，一定要用抗溶性泡沫扑救。
参考答案：对
简述货运服务和快速货运服务的含义。
You can't imagine _____ when they heard the good news.[ ]
A. how excited they were
B. how they were exited
C. how excited were they
D. they were how excited
