某班级一次英语考试成绩服从正态分布,全班平均成绩为70分,标准差为8分,一个学生成绩 发布时间:2017-12-15 13:02 │ 来源:www.tikuol.com 题型:单项选择题 问题: 某班级一次英语考试成绩服从正态分布,全班平均成绩为70分,标准差为8分,一个学生成绩为80分,他在全班的名次为前( )。A.10%B.20%C.30%D.40%
题型:单项选择题 补全对话(填入适当的单词)Tina: 1 was your day off, Tony?Tony: It 2 terrible! I 3 very hard for my math exam last week, so I 4 late. Can you believe it? When I 5 up, it was already 12 o'clock.I got 6 and went to my friend's house, but he 7 there. He was at the beach.Tina: So what 8 you do?Tony: I helped my mom and dad 9 the yard.Tina: Sounds like a busy 10 off. 查看答案
题型:单项选择题 关于红斑的叙述,何者错误()A.皮肤接受一定剂量的紫外线后,被照射区皮肤立即显现红斑,称为红斑反应B.紫外线照射剂量越大,红斑潜伏期越短C.长波紫外线的照射剂量越大,红斑潜伏期越长D.紫外线剂量小时,红斑持续时间短E.紫外线波长297nm引起的红斑反应最明显 查看答案