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【单选题】
关于公式 K2 = e 说法错误的是A.
表示 X 线透过物质后的分布差异
B.
μ 为吸收系数
C.
d 为 X 线穿过物质的距离
D.
K2 与物质的特性无关
E.
μ 随管电压升高而降低答案
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举一反三
【单选题】（72） is a collection of data sets, which is so large and complex that it becomes difficult to process using on-hand database management tools or traditional data processing applications.
A.
Big data
B.
Cluster
C.
Parallel computing
D.
Data warehouse
【单选题】Which of the following statements is supported by the passage?
A.
A scientist's most difficult task is testing hypotheses.
B.
It is better to revise a hypothesis than to reject it.
C.
Theories are simply imaginary models of past events.
D.
A good scientist needs to be creative.
【单选题】(That) the sun (but) not the earth (is) the center of our planetary system (was) a difficult concept to grasp in the Middle Ages.
A.
That
B.
but
C.
is
D.
was
【单选题】The public launched a demonstrations against the summit with respect to
A.
political difficulties.
B.
its strong influence.
C.
imaginative ideals.
D.
its social welfare.
【单选题】They didnt feel the least bit frustrated even when they were confronted with ______difficulties.
A.
grave
B.
fantastic
C.
temporary
D.
implicit
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