水环式真空泵是利用各个叶片间互不相通的（）变化达到吸气、排气目的。A、叶轮B、空腔容

As young students, you have many dreams. These dreams can be very big, such as winning the Noble Prize; they can also be small, such as becoming one of the best students in your class. Once you find a dream, what do you do with it?  小题1:

Andrew Matthews, an Australian writer, tells us that making your dreams real is life’s biggest challenge. You may think you’re not very good at some school subjects, or that it’s impossible for you to become a writer.  小题2:

 小题3: The first thing you must do is to remember what your dream is. Don’t let it leave your heart. Keep telling yourself what you want every day and then your dream will come true faster. You should know that a big dream is, in fact, made up of many small dreams.

 小题4:There will be difficulties on the road to your dream. But the biggest difficulty comes from yourself.    小题5: Studying instead of watching TV will help you get better exam results, while saving five yuan instead of buying an ice cream means you can buy a new book.

As you get closer to your dream, it may change a little. This is good as you have the chance to learn something more useful and find new hobbies.

从方框中所给的选项中选出能填入空白处的最佳选项，补全短文。其中有一项为多余

选项。(10分)

水准仪测量法是高程测量最精确的方法之一，它是利用水准仪提供一条水平视线进行测量的方法，如图甲所示进行测量。据图回答1—2题。

1、已测得A点的海拔为53.195米，通过水准仪A标尺的读数为1.386米，B标尺的读数为0.824米，判断B点的海拔高度及与A的相对高度分别是[ ]

A．54581米、1.386米

B．55.405米、2.210米

C．53.757米、0.824米

D．53.757米、0.562米

2、图乙所示为一中学地理活动小组用简易方法测得某地高程情况，如果该地降水丰富，根据图中信息判断，图示区域可能有几条较大的溪沟[ ]

A．一条

B．二条

C．三条

D．四条

公安队伍正规化就是公安机关运用( )的标准调整和约束公安队伍建设的各个方面，形成符合队伍特点的组织机制、运行机制和管理模式，从而使公安机关达到指挥畅通、内务规范、工作高效、保障有力的最佳状态。

A．系统、规范

B．科学、高效

C．统一、科学、有效

D．统一、科学

下列关于建设程序与建设工程监理的说法( )是不正确的。

A．建设程序为建设工程监理提出了任务、内容和规范化的行为标准

B．坚持建设程序是监理人员的基本职业准则

C．严格执行我国建设程序符合国际惯例

D．建设程序明确了监理企业在建设工程中的重要地位

靶核的质量数A越大，对快中子的减速能力（）。氢核的A最小，它对快中子的减速能力（）。