【单选题】So absorbed ______in his work that he didn't realize I was standing behind him.
【单选题】按正态分布规律,测量值 x 出现在 μ-σ ≤ x ≤ μ+σ 区间的概率是
【单选题】He was so on his work that he didn’t hear her come i n .
【判断题】纤毛是上皮细胞游离面伸出的粗而长的突起,具有节律性定向摆动的能力。
【判断题】纤毛是上皮细胞游离面伸出的粗而长的突起,单根纤毛光镜下可以看到。
【单选题】按正态分布规律,测量值 x 出现在 μ-σ ≤ x ≤ μ+σ 区间的概率是