政府主体
简述海伊斯科普课程的目标、内容、方法和评价。
下列属于电离辐射对机体间接损伤的是（） ["RNA分子结构被破坏","DNA分子结构被破坏","酶生成自由基","水分子电离"]
天然气集输系统的特点是气体在（）的管道里进行连续输送。 ["敞口","密闭","环状","单线"]
class A { A（） { } } class B extends A { } Which two statements are true？（） [" Class B’s constructor is public."," Class B’s constructor has no arguments."," Class B’s constructor includes a call to this（）."," Class B’s constructor includes a call to super（）."]
传染病疫情报告人
