行政公文的主要作用包括领导与指导作用，（）等。 ["宣传与教育作用","联系与告知作用","凭证与依据作用","历史与现实作用"]
This system is only applicable（）those ships which are anchored at the roadstead waiting for entry. ["to","for","with","o"]
焙烧的目的是什么？
在高斯平面直角坐标系中，6º分带的第20带的中央子午线为（） ["120º","123º","117º","114º"]
什么是子宫胎盘卒中？
新生儿窒息复苏的预防有哪些？
