激素通过扩散而作用于邻近细胞称为
A．远距分泌
B．脉冲式分泌
C．神经分泌
D．旁分泌
E．外分泌
参考答案：D
His movie won several awards at the film festival, _____ was beyond his wildest dream. [ ]
A. which
B. that
C. where
D. it
立柱活塞使用什么密封？并简述其基本结构与特点是什么？
