问答题 The reactor types of the fourth-generation reactors include ultra-high temperature gas-cooled reactors, gas-cooled fast reactors, [填空1] , [填空2] , [填空3]  and [填空4] .

单项选择题 ‌设函数在内有定义，且，则有（   ）.​

不定项选择 若X~N(1,2),则2X-1~N(1,8).