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发生烧烫伤，现场急救首先是（）。
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(1) is a method of constructing a project schedule network diagram that uses boxes or rectangles, referred to as nodes, to represent activities and connects them with arrows that show the dependencies.This method includes following types of dependencies or precedence relationships: (2) the initiation of the successor activity, depends upon the completion ofthe predecessor activity.(3) the initiation ofthe successor activity, depends upon the initiation ofthe predecessor activity.空白（3）处填（）
电力机车通风机分为离心式风机和（）风机。
()是指对在自然条件下的混凝土制品适当地采取一定的保温、保湿措施，并定时定量向混凝土浇水，保证混凝土材料强度能正常发展的一种养护方式。
访问控制机制有哪几类？有何区别？
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