【单选题】Not until he promised to return it to me as soon as possible ____ my electronic dictionary to my classmate.
【简答题】在《证明二》一章中,我们学习了很多定理,例如:①直角三角形两条直角边的平方和等于斜边的平方;②全等三角形的对应角相等;③等腰三角形的两个底角相等;④线段垂直平分线上的点到这条线段两个端点的距离相等;⑤角平分线上的点到这个角两边的距离相等、在上述定理中,存在逆定理的是______(填序号)
【简答题】已知下面著名的“勾股定理”:在一个直角三角形中,两条直角边的平方之和等于斜边的平方. 试问:是否存在同时满足下列两个条件的直角三角形? (1)三条边长均是; (2)一条直角边为素数(也称质数)p.若存在,请求出另一条直角边长;若不存在,请说明理由.
【单选题】He should______be allowed to get up until he has completely recovered from his illness.
【单选题】I_____ until he told me to.
【简答题】Put the story in order. a where he learnt to read and write. b He stayed there until he was six, c When Tom was three, d and then he went to college. e After that, he went to s...
【单选题】DOS已执行了一条命令,如要接着重复使用这条命令,可按功能键( ).
【简答题】数学小知识: “勾股定理”是指在一个直角三角形中,两条直角边的平方和等于斜边的平方.例如:两条直角边的长分别为3、4,则3 2 +4 2 = 5 2 ,即斜边的长为5. 已知图中两条直角边的长度,求出图中以斜边为直径所作圆的面积.
【单选题】I ______ until he told me to.