【多选题】【2012-75】下列成本费用中,属于经营成本的有( )。
【简答题】下列轴承中,只能承受径向力的轴承为( )。
【单选题】He (will) not (borrow) you the money (even) if you (ask).
【简答题】设随机变量 X ~ N (1 , 4) ,则
【判断题】Ask first even for situations that don't require permission, it's still considered good practice to ask before doing.
【简答题】设随机变量X~N(1,4),求概率P{1<X≤2}.