一个质量均匀的正四面体型的骰子,其四个面上分别标有数字2,3,4,5。若连续投掷三次,取三次面向下的数字分别作为三角形的边长,则其能构成直角三角形的概率为( )。
在交流干扰排流时,利用钢质接地体与管道连接的排流方法称为()
A、固态去耦合器接地排流
B、直接接地排流
C、强制排流
D、极性排流
The speaker mentioned all of the following as effects of mass transportation on cities EXCEPT A. Growth in city area. B. Separation of commercial and residential areas. C. Changes in life in the inner city. D. Increased standards of living.