单项选择题

WSC-S 测色色差计根据（）测定样品的色泽
A 样品的反射光
B 样品的光透过率
C 样品的光吸收强度

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多项选择题

假设随机变量服从标准正态分布，且相互独立，则以下说法正确的有：
A、
B、
C、
D、

单项选择题

Development of international settlement does not include ( ). A.
from Barter to cash B.
from cash to non-cash C.
from indirect settlement to direct settlement D.
from payment on delivery to payment against document