三级培养
参考答案：
是以大量生产藻细胞为目的培养，多采用开放式（封闭式）充气培养。
I don't know who gave you a call, but it was a girl's _____. [ ]
A. sound
B. number
C. answer
D. voice
WK---4型电铲、主电动机的额定功率为（）千瓦。
