灭菌法是指杀灭或除去物料中所有微生物的何种成分和芽孢的技术
A．荚膜B．鞭毛C．繁殖体D．菌毛E．细胞壁
参考答案：C
He transplanted the young tree to the park ____ it was the best time for it .
A．where
B．when
C．what
D．that
简述氮气升压液氨装瓶的步骤？
