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突出矿井的巷道布置应当符合什么要求和原则？

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酸化施工中常加人一定量的醋酸，其目的是什么？

A customer has ordered a rack， a p650， two p630s， and two p615s. During a conversation on installation planning， the pSeries technical specialist recognizes that the customer expects the rack to arrive as one unit. However， the specialist knows that the p650 will be racked， but the other systems will arrive separately. In fact， the other systems are CSU （Customer Set Up）. Why should the specialist immediately inform the customer that additional racking is the customer’s responsibility？（）

A. Because additional systems would require more power receptacles
Because the customer may need to do additional facilities planning
C. Because the customer needs additional funding to cover the services
D. Because postponing the eventual discussion will likely lead to customer dissatisfactio

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现代社区管理应具有哪些特征？

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柴胡中具有保肝作用的成分是（）

A. 柴胡皂苷
B. 柴胡挥发油
C. 柴胡多糖
D. 麻黄碱
E. 细辛挥发油

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