【简答题】用科学记算器计算锐角α的三角函数值时,不能直接计算出来的三角函数值是( ) A.cotα B.tanα C.cosα D.sinα
【单选题】“提高用户对检索结果的点击率”,这属于搜索引擎营销的目标层次中的( )
【判断题】同等情况下湿式离合器比干式离合器散热性能好
【判断题】正角的三角函数值都是正的,负角的三角函数值都是负的。
【单选题】Which of the following is not a characteristic of the Open University?
A.
It’s open to everybody.
B.
It requires no formal educational qualifications.
C.
No university degree is awarded
D.
University courses are followed through TV, radio etc.
【判断题】已知一个三角函数值,利用 同角三角函数的基本 关系式可以求其他的 三角函数值。 对
【单选题】Which of the following is not a characteristic of the open university?
A.
It is open to everybody.
B.
It requires no formal educational qualifications.
C.
No university degree is awarded.
D.
University courses are followed through TV, radio, correspondence, etc.