关于流动效率EF与表皮系数S的关系，描述正确的是（ ） A: S>0，则EF<1 B: S<0，则EF>1 C: S=0， 则Ef=1 D: S=1， 则EF=0

Who is “Dee”?

The<br/>climax of “Everyday Use” occurs when ____. A: the<br/>mother takes the quilts from Dee and gives them to Maggie B: Dee's<br/>boyfriend arrives C: Dee<br/>makes dinner for her boyfriend D: Dee sets fire to the house

已知ab=cd=ef=57，且2b-d+5f≠0，则2a-c+5e2b-d+5f=______．

The climax of the short story Everyday Use is ______. A: Dee taking pictures of the house B: the argument over the quilts C: the dinner D: Dee's leaving

2. Dee(Wangero)and Maggie have very distinct personalities.

The daughter’s name is . A: Frank B: Dee C: Polly

Why do Dee and Mama disagree? ____ A: Mama<br/>places little value on education or hard work. B: They<br/>have different ideas about what is important in life. C: Mama<br/>resents Dee for setting the fire that burned down their first house. D: Dee<br/>and Mama both want everything for themselves.

在二元线性回归模型中，表示（ ）。/ananas/latex/p/325114/ananas/latex/p/5883

含有透明通道的图片格式是什么? A: jpg B: gif C: png D: 0