结核分枝杆菌为需氧菌,什么环境下能刺激其生长()
A.适宜生长温度34℃
B.20%~30%CO2
C.培养时间6~8周
D.培养时间2~4周
E.5%~10%CO2
参考答案:E
除氧封存养护技术中的除氧剂一般选用
A.镁粉
B.锌粉
C.钙粉
D.活性铁粉
E.硼酸粉
The last time we had great fun was________ we were visiting the Water Park. [ ]
A. where
B. how
C. when
D. why