气提工艺可使贫TEG浓度最高达到()。
A、99%
B、99.6%
C、99.9%
D、98.5
参考答案:B
可被口腔中的唾液链球菌杀死的是()。
A.肠毒素
B.过氧化氢
C.抗菌性脂类
D.脑膜炎球菌
E.溶血性链球菌
One day Chuck is on a flight ______ the Pacific Ocean suddenly ______ his plane crashed.
A. through while B. through whenC. across when D. across while