【简答题】A.He has a headache. B.He failed his history exam. C.He is sleepy. D.He is too busy.
【判断题】车轮内侧外缘凸起的部分叫轮缘,它的主要作用是防止脱轨。
【单选题】A) He has just too many things to attend to. B) He has been overworked recently. C) He has a difficult decision to make. D) He has just quarreled with his girlfriend.
【判断题】完全图K 4 的所有非同构的生成子图中,4条边的有4个.
【单选题】He has too ______ a nature to get angry, even if he has good cause.
【简答题】(14分)已知A、B、C、D、E、F是短周期中的6种非金属元素,它们的原子序数依次增大。A元素是周期表中半径最小的元素, B原子的最外层上有4个电子;C与D在周期表中处于相邻的位置,D的阴离子和E的阳离子具有相同的电子层结构,两元素的单质反应,生成一种淡黄色的固体Y;F的L层电子数等于K、M两个电子层上电子数之和 (1)请写出元素符号: A B C D E F (2)画出F的阴离子的结构示意图 (...
【单选题】What is the man's problem?
A.
He hasn't received an important report.
B.
He has too many expenses.
C.
He cannot contact the courier.
【简答题】A.He has a headache. B.He failed his history exam. C.He is tired. D.He is too busy.
【单选题】完全图K 4 的所有非同构的生成子图中,有几个是3条边的