【单选题】The authors attitude towards present pre-school age is______.
【单选题】向100g FeCl 3 溶液中放入一小块钠,待反应完全后,过滤,得到仍有棕黄色的溶液91.8g,则投入钠的质量为( )
【单选题】向饱和硫酸铜溶液中放入一小块硫酸铜晶体,条件不变,静置几天后,硫酸铜晶体的变化是 [ ]
【单选题】According to the passage, which of the following is TRUE?
A.
Poor pre-school kids have a larger vocabulary than rich kids.
B.
President Obama believes that early education can solve all economic and social problems.
C.
Rich pre-school kids have a richer vocabulary than poor kids.
D.
President Obama's education secretary thinks it is morally wrong to let kids start kindergarten early.
【判断题】Pre-school and pre-prep programs in Australia are compulsory.
【判断题】正截面承载力计算的基本假定 中, 根据以上四个基本假定,从理论上说钢筋混凝土构件的正截面承载力的计算已不存在问题。
【多选题】对代码段: node* pre=nullptr,*p=head; while(p&&p->next){ pre=p; p=p->next; } 描述正确的是
B.
while(p&&p->next) 可以修改为while(p->next)
C.
该代码的目标是定位p是链表的表尾结点,同时保存链表的倒数第二个结点。
D.
该代码可能的情况有: 链表为空,那么p也是空; 链表只有一个结点,那么p就是这个结点。 链表有两个结点,那么pre是表首结点。 链表有两个以上的结点,那么p是表尾结点。