三个重力相同的小球甲、乙、丙，分别悬浮在酒精、水和盐水中，它们所受浮力的大小是[

用手握住一个油瓶，使瓶在竖直方向保持静止，如图所示，下列说法正确的是（　　）

A．瓶受到的静摩擦力大于其重力

B．手握得越紧，油瓶受到的摩擦力越大

C．油瓶质量不变，则受到的摩擦力一定

D．油瓶受到的摩擦力与手对它的压力成正比

阅读理解。

A: Hello, Judy. How are you getting along with your word processing (文字处理) class?

B: Well, so far progress has been rather slow. I haven't learned the keyboard yet, and I have problems

    remembering all the orders of editing. I get really impatient because I want to master the means to

    operate the computer as soon as possible.

A: Just remember that Rome wasn't built in a day. Word processing (文字处理) can't be such an easy

    matter.

B: You're right. Our teacher keeps telling us that it takes time to learn all the techniques (技巧) of word 

    processing and that we can't master everything in one day.

A: That' s entirely true. But you'll catch on. Just be patient and practise whenever you can.

1. This dialogue suggests that Judy and the partner ______. [ ]

A. may be friends

B. are studying in the same class

C. are both learning word processing

D. are both tired of study

2. What's the main idea of the dialogue?[ ]

A. Word processing isn't an easy thing at all.

B.Only step by step can we master something.

C. True friendship will benefit our progress.

D. Truth comes from practice.

3. "Rome wasn't built in a day" means that we should be ______. [ ]

A. patient

B. hardworking

C. friendly

D. impatient

4. Judy has difficulty in doing the following things except (除了) ______. [ ]

A. word processing

B. making progress

C. learning the keyboard

D. remembering all the orders of editing

道德和法律同样具有强制性和很大的调节性。

组合机床自动线相邻机床中心距偏差不应大于（）mm。

A、0.06

B、0.08

C、0.10

D、0.12

公安机关要按照德才兼备、任人唯贤的原则和( )的方针，选好各级公安机关的领导班子，以一流的班子带出一流的队伍，一流的队伍干出一流的工作，一流的工作创造一流的业绩，确保人民的安居乐业，国家的长治久安．

A．抓班子、带队伍、促工作、保平安

B．革命化、年轻化、知识化、专业化

C．科技强警

D．一手抓队伍，一手抓业务