如图, AB 为⊙ O 的直径, CD 为弦, AB ⊥ CD ,如果∠BOC = 70 ,那么

如图, AB 为⊙ O 的直径, CD 为弦, AB ⊥ CD ,如果∠BOC = 70 ,那么∠A的度数为(     )

    

A.    B.      C .      D.

 

答案

B

 解析:略

 

相关题目

基因自由组合定律在实践中的应用:①_____________________________
基因自由组合定律在实践中的应用:①_____________________________________________________________________;②通过基因间的_________________,产生人们需要的具有两个或
 “如果同一个人或是由重要人物、贵族或平民组成的同一个
 “如果同一个人或是由重要人物、贵族或平民组成的同一个机关行使这三种权力,即制定法律权、执行公共决议和裁判私人犯罪或争讼权,则一切便都
  There were a lot of hardships when growing up, but there were a lot of fond m
  There were a lot of hardships when growing up, but there were a lot of fond memories as well.   Back in those days, we had very little money, so we couldn’t afford a garden tractor that could ma
This sentence    right. Please write it down.A.feels B.soundsC.tastes
This sentence    right. Please write it down.A.feels B.soundsC.tastes D.smells
粗盐提纯实验的部分操作如图所示,其中错误的是(   )
粗盐提纯实验的部分操作如图所示,其中错误的是(   )
有这样一道题:先化简,再求值:,其中“”。小亮同学做
有这样一道题:先化简,再求值:,其中“”。小亮同学做题时把“”错抄成了“”但他的计算结果也是正确的,请你解释这是怎么回事。
北宋初期,行使监察职能的御史弹劾官员时很少涉及宰相。
北宋初期,行使监察职能的御史弹劾官员时很少涉及宰相。至北宋中期,御史则与宰相“分为敌垒,以交战于廷”。这种现象反映了   A.官僚内部斗争
In many countries, ___46___ is not unusual for families of different background
In many countries, ___46___ is not unusual for families of different backgrounds to live together in the shared space. ___47___, in the United States, this idea may still be considered strange. But

最新题目