反复呕吐可导致电解质紊乱，损失最多的是
A．Na+
B．Cl-
C．H+
D．K+
E．Ca2+
参考答案：A
—Do you know when the 29th Olympic Games ______? —Yes, in 2008.
A. hold B. is held C. was held
分离肠道致病菌不选用的培养基是（）
A.中国蓝琼脂
B.伊红-亚甲蓝琼脂
C.麦康凯琼脂
D.HE琼脂
E.罗-琴培养基
