放射免疫试剂盒的质量控制中,交叉反应率应为() A. B. C. D. E. 发布时间:2017-08-31 21:25 │ 来源:www.tikuol.com 题型:单项选择题 问题: 放射免疫试剂盒的质量控制中,交叉反应率应为()A.<1%B.<2%C.<5%D.<10%E.<15%
题型:单项选择题 It ______ usually ______ at this time of year, but today it is raining heavily. A. is; raining B. won't; rain C. has; rained D. doesn't; rain 查看答案