Ra能客观全面地反映表面微观几何形状特征，Ra值越大，表面越粗糙。
A、正确
B、错误

单项选择题灵敏度可以用于评价原子吸收分光光度法。 A、正确 B、错误

单项选择题Which of the underlined path in the following sentences is NOT used in the same way as “path” in the sentence “I knew we were on a new and unexpected path.” A、They may not take a direct path, but somehow they reach their dreams. B、It came right at me, but his love so overwhelmed me that I was incapable of moving out of its path. C、The path continues alongside the river for half a mile. D、The Tourist Board seems well on the path to achieving its new objective.

单项选择题心衰病人使用利尿剂时应特别注意 A. 心率变化 B. 血压变化 C. 电解质变化 D. 肾功能变化 E. 肝功能变化

单项选择题吃饭时,谁负责将饭抬到教室?()

多项选择题What are the methods to help you make a strong prepared speech? ( )A. Understand the audience and occasion.B. Decide on a central point or purpose.C. Use various supporting materials.D. Use clear organization.