【单选题】A派生子类B,B派生出子类C,在Java源代码中声明如下,以下说法哪个正确?Aa1=newA();Aa2=newB();Aa3=newC();
C.
所有行都能通过编译,但第2和第3行运行时出错。
【判断题】花岗岩的矿物成分以铁镁矿物为主,长石含量很少或无。
【多选题】询问法是以询问的方式作为收集资料的手段。主要包括( )形式。
【简答题】根据括号中的中文含义,运用视频中学到的动词(或词组)的合适形式填空: He often ____ his keys at home (把钥匙遗忘在家里).
【简答题】He often ? his keys at home (把钥匙遗忘在家里).
【单选题】Mr. Black’s memory is getting ______. As a result, he often leaves his keys at home.
【简答题】A: (1) ________________________ B: She often reminds him about his keys / to take his keys along. A: (2) ________________________ B: He is often reminded to take his keys along.
【简答题】课件上第二讲第4.5.6题写纸上,第三讲第3题写纸上,其他题上课提问,写整数的原码补码及其对应的真值,黑板上的一个题,附图。 [2]课本63页4.(2) 5.(3) 6.(3) 注: 纸上的作业周四早上收
【简答题】John is very___________( 粗心的 ) and he often loses his keys.
【单选题】He often _________________his keys at home.