单项选择题

关于荧光抗体染色技术中F/P值叙述正确的是
A、F/P值是指荧光素占蛋白质的百分比 
B、F/P值越高说明抗体分子上结合的荧光素越多 
C、F/P值越高说明抗体分子上结合的荧光素越少 
D、测读A260与A280处的特异吸收峰之比 
E、以上都不对

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单项选择题
Gillen assumes that people's perception of one's attractiveness is sex-related, and is not sex-related, but the test result of his hypothesis indicated that ______.A.sex plays a major role in people's perception of one's attractivenessB.sex does not influence people' s perception of one's attractivenessC.both sex and other elements play a role in one's perception of attractivenessD.elements other than sex play a role in people's perception of attractiveness
A.A.sex
B.sex
C.both
D.elements
问答题
80C51单片机片内RAM中位寻址区的地址范围是____,工作寄存器区的地址范围是____。
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