A:氧气进入红细胞
B:葡萄糖进入红细胞
C:唾液淀粉酶的分泌
D:水进入小肠上皮细胞
根据句意及首字母提示补全单词。(1)Four people are in my f____ . They are my parents, my sister and I.(2)Mr. Li wants to b____ a pair of pants in the clothes store.(3)—Could you help me with my English?—No p____ . (4)The boy is my uncle's son. He is my c____ .(5)—How do you say 6:15 in English?—It's a quarter p____ six.
使用年限x
2
3
4
5
6
维修费用y
2.2
3.8
5.5
6.5
7.0
部分数据分析如下 ∑i=15yi =25, ∑i=15xi yi=112.3, ∑i=15xi =90
参考公式:线性回归直线方程为 y^=b^x+a^ , b^=∑i=1nxiyi−nx¯⋅y¯∑i=1nxi2−n⋅x¯2
在草履虫的下列结构中能完成运动功能的是( )