Hardlyhadhefinishedhisspeech________theaudiencestartedcheering.
Whenworkersareorganizedintradeunions,employersfindithardtolaythem________.
二维随机变量(X,Y)在D=(x,y)0<y<1-x2上服从均匀分布,求Z1,Z2联合分布。
Thosewho’dliketovisittheexhibition________(sign)yournameshere.
设A,B是两随机事件,则事件AB表示()