母乳喂养儿肠道菌群主要为()
A.肠道球菌
B.大肠埃希菌
C.双歧杆菌
D.白色念珠菌
E.空肠弯曲菌
参考答案:C
After a _____ discussion, they came up with a new ____ to the study of physics. [ ]
A. two hours', access
B. two hours', way
C. two-hour, approach
D. two-hour , method
()疏水器由于控制孔连续泄漏,所以排气性能较好。
A、机械型
B、恒温型
C、脉冲型
D、热动力式