多项选择题

与梅尼埃病有密切关系的脏腑有（）
A、肝
B、肺
C、脾
D、肾

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单项选择题

Suppose that in a population the frequency of a particular recessive condition is 1/400. Assume the presence of only a dominant allele (A) and a recessive allele (a) in the population and that the population is at Hardy–Weinberg equilibrium. What is the frequency of the recessive allele that causes the condition?
A、0.000625
B、0.0025
C、0.025
D、0.05
E、0.95

单项选择题

下列哪种不是贴片封装

A．SOT-89
B．DIP16
C．SOT-223BGA