我国现行非碘盐的标准为（）。
A.20mg/kg
B.<15mg/kg
C.<25mg/kg
D.<5mg/kg
E.<10mg/kg
参考答案：D
In the dark forests ______, some large enough to hold several English towns. [ ]
A. stand many lakes
B. lie many lakes
C. many lakes lie
D. many lakes stand
低动力型休克可以使用（）
A.缩血管药
B.扩血管药
C.补充血容量
D.强心药
E.碳酸氢钠
