多项选择题

怎么选择底妆产品？ A.
根据肤色 B.
根据个人喜好 C.
根据肤质 D.
看别人使用效果

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单项选择题

A beam of partially polarized light of intensity I0 passes through an ideal polarizing filter. Rotating the polarizer makes the ratio of maximum to minimum intensities of the transmitted light equal to Imax / Imin = 3 / 1. What is the percentage of linearly polarized light of the incident light?
A、50%
B、67%
C、25%
D、75%

酶只能改变化学反应的活化能而不能改变化学反应的平衡常数。( )

答案： \n正确