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【简答题】
定义在区间 (0， π 2 ) 上的函数y=6cosx的图象与y=5tanx的图象的交点为P，过点P作PP 1 ⊥x轴P 1 ，直线PP 1 与y=sinx的图象交P 2 ，则线段P 1 P 2 的长为______．
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皮皮学刷刷变学霸
举一反三
【单选题】光栅传感器的工作原理, 是将被测物体的位移通过光栅转换成 的移动,再将条纹移动转换从电信号变化,从而检测直线位移或角位移。
A.
光线
B.
光栅尺
C.
莫尔条纹
D.
电信号
【单选题】______ surprised us most was that with all his money, he _______ worry about a little thing like 5 cents.
A.
It; could
B.
What; could
C.
What; should
D.
It; should
【单选题】The first thing that ______ in his speech is that he didn’t put us in the picture at all about the war.
A.
stands by
B.
stands in
C.
stands out
D.
stands for
【简答题】什么是顾客的满意度和顾客的忠诚度
【简答题】阅读理解。 Jeff Green can not look after his things. Look, this is his room. He doesn't put his things away (收好) every day. Look at his desk. Many things are on it. They are notebooks, CDs, video tapes, pe...
【简答题】A student went to college after 21 all his school examinations. There he put his name down for world geography,22 after the first day, he did not go to 23 any more. The teacher noticed that this stude...
【简答题】Translation : 他献身于教育事业。
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