【多选题】求1~100的和,编程时,循环控制条件应哪些是正确的(循环控制变量是i)?
【判断题】物流系统结构要素之间出现“效益背反”现象的原因是物流系统复杂性的表现。
【判断题】严格地说,EXCEL数据清单中不允许存在相同的记录。( )
【单选题】Sam uses his voice to show that he is____what he is saying.
【简答题】Why doesn’t Sam eat his cake?(Sam为什么不吃蛋糕)A. He doesn’t like it. B. He
has a toothache(牙疼). C. He
wants to save(保留) it. D. He has trouble opening his mouth.