单项选择题

利用投影面垂直面的( )投影,可以直接求出直线与平面的交点
A、定比性
B、从属性
C、积聚性
D、真实性

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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
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
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