L型菌
参考答案：
是细胞壁缺陷型细菌，形态呈多形性.在高渗低琼脂含血清的固体培养基中产生荷包蛋样菌落.L型菌仍具有致病性.
He planned __________ time with his family during May Day.[ ]
A. spends
B. spending
C. to spend
D. spend
简述氢气系统的消防措施及灭火方法。
