【单选题】_____ Miguel gets home, we’ll be eating dinner. A. By the time B. in time C. By
【判断题】在循环体中若修改循环变量的值,会改变循环的次数。( )
【单选题】一个整体由5个元素组成:3,7,8,9,13。该总体的均值为
【单选题】一个总体由5个元素组成;3, 7, 8, 9, 13。该总体的均值为
【简答题】已知W、X、Y、Z都是短周期的元素,它们的原子序数依次增大。W原子的电子层数与它的核外电子总数相同,而Y原子的最外层电子数是次外层的三倍,Z原子的质子数是Y原子的电子数的两倍,X和Y可以形成红棕色气态化合物,则 (1)X元素形成的单质的电子式是_________________,Z元素在周期表中的位置是__________。 (2)由X和Y组成,且X和Y的质量比为7:8的化合物的化学式(分子式)是...
【简答题】Can I take your order? A.Steamed dumplings are very popular. 2. What’s the specialty here? B.Tsingtao Beer, please. 3. Would you like some...
【简答题】将下列句子重新排序,编成对话,然后将句子前的字母写在相应序号后。 a. Sugar, please. No milk. b. Yes. Would you like milk and sugar? c. OK. A coffee with sugar. d. Would you like a drink? e. Yes, please. Could I have a coffee? (1) (2...
【单选题】一个总体由5个元素组成;3, 7, 8, 9, 13。该总体的方差为
【简答题】Can I take your order? A.Steamed dumplings are very popular. 2. What’s the specialty here? B.Tsingtao Beer, please. 3. Would you like some...