設(shè)隨機(jī)變量(X,Y)服從二維正態(tài)分布N(0,0;1,4;-1/2),隨機(jī)變量中服從標(biāo)準(zhǔn)正態(tài)分布且與X獨(dú)立的是()
A、C
How long ________ they ________ (dig) the ditch?
For the new country to survive, ________ for its people to enjoy prosperity, new economic policies will be required.
This diploma ( 畢業(yè)文憑 ) ________ that you have completed high school.
1949 年黨的七屆二中全會(huì)提出“兩個(gè)轉(zhuǎn)變”同時(shí)并舉的思想是指___________。
中國新民主主義社會(huì)屬于 _________。
