可引起低血钾的原因有()
A．钾的摄入不足
B．尿钾排出过多
C．碱中毒
D．胰岛素过多
E．钡中毒
参考答案：A, B, C, D, E
As is known to us all, failure usually ___ laziness while diligence can ____ success.
[ ]
A. results from; lie in
B. results in; result from
C. leads to; lie in
D. results from; result in
用气相色谱法分析样品的定性依据是（）
A.峰高
B.峰面积
C.峰宽
D.保留时间
E.死时间
