小明在“课外新世界”中遇到这样一道题：如图1，已知∠AOB=30°与线段a，你能作出边长为a的等边三角形△COD吗？小明的做法是：如图2，以O为圆心，线段a为半径画弧，分别交OA，OB于点M，N，在弧MN上任取一点P，以点M为圆心，MP为半径画弧，交弧CD于点C，同理以点N为圆心，N P为半径画弧，交弧CD于点D，连结CD，即△COD就是所求的等边三角形．

下列仪器不宜用作化学反应容器的是（   ）

设实数x，y满足 $\{\begin{array}{c}x\ge 0\\ y\ge 0\\ x+2y-6\le 0\\ 2x+y-6\le 0\end{array}$ ，则z=|x﹣1|+|y+2|的取值范围为____．

阅读下面短文，然后根据括号内所给汉语意思写出单词的正确形式（每空一词）。

    Last weekend I went to visit my grandma. ____ (虽然) her house is far from mine, I still decided to walk there. It was very sunny so I didn't take my ____ (雨伞). However, on the way it began to rain hard. And soon I was all ____(湿的). When I was thinking about what to do next,  ____ (幸运地), there came a taxi. I ____ (停) it and went into it quickly. When I arrived at my grandma's house, she was very surprised to see me.

     "Is it ____ (必要的) for you to come here on foot?  Why didn't you drive your car here?" She asked.

   "Because I want to take more exercise." I answered.

     "Why did you come on ____ (这样的) a rainy day?"

     "I came to tell you a piece of good news."

   "What good news?"

     "I  ____(赢) the first prize in the singing ____ (比赛)."

     "Congratulations!" said my grandma excitedly, then she ____ (给) me a warm blanket to wrap me.

三个原子核X、Y、Z，X核放出一个电子后变为Y核，后用质子（）轰击Y核生成Z核并放出一个氦核（），则下面说法正确的是