例举并描述薄膜生长的三个阶段。

湿法制粒是目前制备颗粒剂的主要方法。

_____ many times, but he still couldn't understand it. [ ]

A. Though he had been told

B. Having been told

C. Having told

D. He had been told

抑制：热情（）

A.滋润：喉咙

B.分散：注意 

C.消除：声音 

D.反转：方向

继电保护所使用的二次电缆必须是（）。

亮度对比