【单选题】It can be inferred from the passage that it is of vital importance that ______.
A.
one makes money by selling his personal data
B.
one conceals his identity when using the Internet
C.
one keeps his personal information at the office
D.
one goes online as often as he can
【简答题】11.设随机变量 X 服从指数分布,其概率密度为 ,求:(1) λ ;(2) P { X ≥4};(3) P {0< X ≤8};(4) X 的分布函数 F ( x )。
【单选题】It is vital that he___to the new environment as soon as possible.
【简答题】It is vital that he _______(go) immediately.
【单选题】金融危机、经济危机爆发的原因很多,但是在深层次上它是一个()危及。
【单选题】关于大肠多发肉病下列哪项是错误的?( )
【单选题】下列各种方法中:①金属表面涂抹油漆;②改变金属内部结构;③保持金属表面清洁干燥;④在金属表面进行电镀;⑤使金属表面形成致密的氧化物薄膜,能对金属起到防护或减缓腐蚀作用的是 ( )。