直接参加现金预算汇总的是（） ["销售预算","成本预算","期间费用预算","人工预算"]
关于确定信息来源的叙述，不正确是（）。 ["电脑网络上信息非常庞大，所以只需要上网就可以找到自己想要的信息","一般说来，信息源越广阔，收集到的信息量就越大","尽量选择可靠的信息源","力求信息来源具有多样性和代表性"]
锅炉并汽前应（）燃烧，（）蒸汽管道上所有疏水阀。 ["A.减弱；打开","B.减弱；关闭","C.加强；打开","D.加强；关闭"]
请说明CRH2动车组信息网络系统显示器有哪些显示模式？不同显示模式如何切换？
Which of the following statements describes the function of an expansion tank in a diesel engine cooling system?（） ["Maintains a constant head on the system","Reduces the likelihood of air or steam pockets formation","Provides a low pressure point for the addition of makeup cooling water","All of the above"]
自私的基因理论的基本内容是什么？
