All people in the company voted for Mr．Smith．His management and strong character as well as his kind-heartedness made _____ he was as CEO．

A．who

B．which

C．what

D．whom

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