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问题 单项选择题

用于定量的参数是（）.

A．色谱峰高或峰面积 

B．死时间 

C．色谱峰保留时间 

D．色谱峰宽 

E．色谱基线

答案

参考答案：A

选择题
He ______ the job well, but he ______ so careless.

A. hadn't done ; had been
B. could have done ; was
C. could do ; was
D. had done ; had been
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单项选择题

开放性气胸的主要病理生理变化（）

A.反常呼吸运动

B.纵隔摆动

C.进行性伤侧肺压缩

D.呼吸死腔增加

E.血氧分压下降
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