When fire pumps are used for other than firefighting service，each pipe connecting the other service (except for branch lines used for deck washing) must have a（）.
举一反三
- Despite E-marketing service strategy, what are the other common strategies used in E-marketing?
- They ______ nod to each other when they met, and now and then they ______ exchange a word or two. A: would, used to B: would, would C: used to, used to D: used to, would
- 中国大学MOOC: In direct method, each service department assigns its own costs to operating departments plus the costs that have been allocated to it from other service departments.
- What istrue of washing trains? A: Chemical washes are used daily. B: Washing occurs in the inspection shed. C: Detergent must be used with each wash. D: The washing machine recollects and reuses water.
- They used to be at ______ with each other and had quarrels from time to time.