按索赔的( )分类，可将索赔分为单项索赔和总索赔。 A．处理方式 B．依据 C

阅读下面的短文并判断正误。

    David and his brother Sam go to school on their bicycles in the morning. They don't come home for

lunch. They have lunch at school. In the afternoon, David likes to read books and Sam likes to play on

the computer. They have supper at home. They love their teacher and their teacher loves them. They are

very happy.

( )1. David and Sam go to school by bus.

(     )2. They have lunch at school.

( )3. David likes to play on the computer.

( )4. Sam likes to read books in the afternoon.

( )5. Their teacher loves them.

连词成句。

1. heavy, too, ball, is, the (.)

________________________________________

2. I, hit, hands, my (.)

________________________________________

3. Li Ming, the, ball, throws (.)

________________________________________

4. catch, basketball, the (!)

________________________________________

直方图是从总体中( )获得数据，经整理后用等宽矩形来描述分布。

A．全数检查

B．随机抽样

C．按时间抽样

D．按产品抽样

某同学用如图所示装置“研究物体的加速度与外力关系”，他将光电门固定在气垫轨道上的某点B处，调节气垫导轨水平后，用重力为F的钩码，经绕过滑轮的细线拉滑块，每次滑块从同一位置A由静止释放，测出遮光条通过光电门的时间t．改变钩码个数，重复上述实验．记录的数据及相关计算如下表．

实验次数	1	2	3	4	5
F/N	0.49	0.98	1.47	1.96	2.45
t/（ms）	40.4	28.6	23.3	20.2	18.1
t2/（ms）2	1632.2	818.0	542.9	408.0	327.6
υ2	6.1	12.2	18.4	24.5	30.6

（1）为便于分析Fm-mg=m

υ 22

l

，得υ2=

8 3 gl

与l的关系，应作出d-l=

1

2

g

t

22

，x=υ2t2的关系图象，请在坐标纸上作出该图线______

（2）由图线得出的实验结论是：______

（3）设AB间的距离为s，遮光条的宽度为d，请你由上述实验结论推导出物体的加速度a与时间t的关系式为______．

下列减风注意事项中错误的是（）。

A、铁口浅跑大流应减至不跑大流

B、发生大崩料、大管道等需要大幅度减风时，应采取指定风量法减风，以防风量过小造成风口灌渣铁

C、料速超过规定水平减风应减至最低，把料速控制下来

D、风压超标要减至规定范围