【单选题】在齿轮油泵装配图的15种零件中,属标准件的序号是
A.
2,3,4,5,10,12,13,14,15
【单选题】We have made it clear that the packing must be ______ to withstand rough handling.
【简答题】the packing must be strong enough to withstand ______(粗暴的) handling.
【单选题】We have made it clear that the packing must be ____ to withstand rough handling.
【单选题】the packing must be strong enough _________ rough handling.
【单选题】We have made it clear that the packing must be _________ to withstand rough handling.
【简答题】设X为一个连续随机变量,其概率密度函数如下: (1)请计算C的值; (2)请根据计算得到的C值,绘出概率密度函数f(x)ltu ; (3)请计算概率分布函数F(x)并给出其曲线图 (4)请计算P(1/3≤x≤2/3), 以及E(X)与V(X)
【多选题】下列关于气质说法正确的是()
A.
心理学家将气质分为多血质、胆汁质、黏液质、抑郁质
B.
气质是指一个人在情绪体验和行为反应的强度和速度等方面的心理特征
D.
气质本身并无好坏之分,它一旦形成就具有相对的稳定性