Which of the following statements describes the function of an expansion tank in a diesel
A. Maintains a constant head on the system
B. Reduces the likelihood of air or steam pockets formation
C. Provides a low pressure point for the addition of makeup cooling water
D. All of the above
动车组一级检修在每次运行结束后或()以内进行一次。
A. 24 h
B. 36 h
C. 48 h
D. 72 h
1998年11月，世界公园定向组织与_______和_______合作，分别在_______和_______举办PWT赛事的两站比赛。
患儿曹某，家中进食中突发吸气性呼吸困难伴刺激性干咳，最可能的原因是
A. 哮喘发作
B. 自发性气胸
C. 气管异物
D. 肺水肿
E. 心衰
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