物质逆电化学梯度通过细胞膜属于
A．被动转运
B．主动转运
C．单纯扩散
D．易化扩散
E．吞噬作用
参考答案：B
A．30°
B．45°
C．60°
D．90°
-- __________?
--It's nine-thirty. [ ]
A. What is it
B. What time it is
C. What time they are
D. What time is it
