下列与粉尘微粒在空气中悬浮稳定性关系最小的因素是粉尘的
A.形状
B.浓度
C.分散度
D.比重
E.荷电性
参考答案:B
The five mascots of the 2008 Beijing Olympic Games the five colors of the Olympic rings and
"Welcome to Beijing". [ ]
A. stand in
B. instead
C. instead of
D. stand for
为什么喜马拉雅山脉的南坡雪线比北坡低?阿尔卑斯山脉北坡雪线比南坡低?