最容易发生地震液化的土为( )。
A．(A) 饱和黏土
B．(B) 饱和砂土
C．(C) 饱和碎石土
D．(D) 饱和粉质黏土
参考答案：B
I don’t know .
A．what the population of Tianjin is
B．what is the population of Tianjin
C．how much the population in Tianjin is
D．how much is the population in Tianjin
静电放电有哪几种类型？
