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【判断题】
9 - . 摩尔吸光系数的物理意义是当吸光物质的浓度为 1mol/L,液层厚度为25px时,某溶液对特定波长光的吸光度。 ( )A.
正确
B.
错误
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举一反三
【简答题】决定颜色明亮程度的是颜色的那个属性 .
【简答题】CHECK约束被称为______约束,UNIQQUE约束被称为_______约束。
【单选题】Of the two physics problems, Martha just finished ______ one. A. the most difficult B. the least difficult C. the less difficult
A.
the most difficult
B.
the least difficult
C.
the less difficult
【单选题】Do you think maths is _____ than English? [ ]
A.
difficult
B.
as difficult
C.
more difficult
D.
most difficult
【简答题】UNIQUE约束被称为 约束。
【单选题】______, it was completed on time.
A.
Difficult as the task was
B.
Difficult as was the task
C.
As the task was difficult
D.
As was the task difficult
【简答题】CHECK 约束被称为 约束,UNIQUE约束被称为 约束。
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