题目内容

The pianist waited for silence ____ he began to play.

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They promised to wait ____ the clock struck twelve.

He looked pale ____ he had seen a ghost.

地西泮溶于硫酸后,在紫外灯下呈现()

A. 黄绿色荧光
B. 紫色色荧光
C. 蓝色荧光
D. 黄色荧光

( )系指样品中被测物能被定量测定的最低量,其测定结果应符合准确度和精密度要求。

A. 定量限
B. 检测限
C. LOD
D. LOQ
E. 检出限

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