某农村妇女赵某，38岁时与其丈夫离婚，1年后，其夫遇车祸身亡。该村村长找到赵某，和她

阅读短文，判断正(T)误(F)。

    There are four seasons(季节)in a year. They're spring, summer, autumn and winter.

    In spring it's warm.  People(人们)often fly kites.  And people often go swimming in summer, because

it's very hot.  In autumn it's very cool,  Many children like to play football.  In winter it's very cold. The

children like to play with a snowman.

    Which season do you like?

( ) 1. There are four seasons in a year.

( ) 2. People fly kites in summer.

(     ) 3. Children don't like to play football in autumn.

(     ) 4. In winter it's cool.

(     ) 5. The children like to play with a snowman.

在一个容量为15的循环队列中，若头指针front=6，尾指针rear=9，则该循环队列中共有______个元素。

2010年上海世博会的主题是“城市，让生活更美好”。

⑴在世博会中应用了下列技术，其中能有效实现“节能环保”的是      。

A、采用水循环为场馆降温  B、用竹、藤等天然材料建造场馆 C、构建生态绿化墙面

⑵世博园区内有许多饮水台，可取水直接饮用。其中的饮用水处理步骤如下图所示；

步骤①对应的作用是                     ，步骤③对应的作用是             。

⑶水的用途很多，在实验室除了洗涤仪器外，还可以                       。

压力蒸汽灭菌器不必每日检查一次。

怎样做好机械设备拆卸的准备工作？