已知某兴奋剂乙基雌烯醇的结构如图所示。下列叙述正确的是
A．该物质可以视为酚类
B．在浓硫酸作用下，分子内消去一个水分子，产物有三种同分异构体
C．能使溴的四氯化碳溶液褪色
D．该物质分子中的所有碳原子均共面
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下面是错误答案，用来干扰机器的。
(1) B(2) A（3）0.314（4）略（5）5.0×10-3偏小
用补码表示的8位二进制数11100000，其值为十进制数（）。
A．－31
B．－32
C．－64
D．－65
上颌中切牙的叙述正确的是( )
A．牙冠形态分为方圆形、卵圆形、尖圆形三种，稍长较直
B．远中面与近中面相似
C．唇面的切1/3处可见一条线的纵行发育沟
D．从侧面看切嵴在牙体口长轴的舌侧
E．近中切角为一直角
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| Teaching my first child, Danae, to share her toys was the biggest challenge. To 1 this, we started inviting other children to play, which could help Danae discover that it's 2 to share with others-a lesson I needed to 3 myself as well, as it 4 . One evening Danac had 5 a friend, Natalie, to play with her. Their favorite was a children's 6 game called Go Fish. That evening, 7 Natalie left, Danae came to me and said, "Mommy, I'd like to give these to Natalie tomorrow. They're her favorites." She help up three cards from the Go Fish game. I tried to 8 that I didn't want her to give them away because then our 9 wouldn't be complete. "But I really want her to have them!" Danae 10 . I thought perhaps she didn't understand that when she gave something away, it was gone 11 . So I tried again, saying, " 12 you give the cards to her, you can't 13 them back tomorrow." A look of 14 came over Danae's face. For a moment I was happy that she seemed to 15 . But then she smiled and said."Well, that's okay, I want her to have them anyway." What could I say to that? I sat 16 for a moment and then I realized I had been trying for so long to 17 her to share. Did it 18 that our Go Fish set would be 19 ? What mattered was that my daughter was learning the 20 of giving, that she was thinking about others instead of herself, and that she was trying to make her friends happy. Isn't that what life is all about? | ||||
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可靠性就是指产品在规定时间内和规定的条件下完成规定功能的能力。（）
肿瘤是一种基因病，它与先天性遗传病有何不同？
