进空分装置的原料空气温度高时，空气中的饱和水分含量（）
A、减少
B、不变
C、增大
参考答案：B
CO2和NH3在体内跨细胞膜转运属于
A．单纯扩散
B．易化扩散
C．胞吐或胞吞
D．原发性主动转运
We don’t need a lot of friends _______ they are good.
A．as many as
B．as much as
C．as long as
D．as more as
