预防未成年人犯罪的教育目的是增强未成年人的______。

某同学在自主学习“中国历代官制”时，找到了以下材料：“……⑤兖州部刺史——掌察举兖州3国5郡115县；⑥青州部刺史——掌察举青州3国6郡121县；⑦豫州部刺史——掌察举豫州2国3郡108县；⑧徐州部刺史——掌察举徐州3国4郡132县。……”请你帮助该同学判断该材料体现的是哪个朝代的政治制度[ ]

A．西周

B．西汉

C．东汉

D．唐朝

JL12系列过电流继电器具有反时限保护特性：当电流为额定值时，不动作；当电流为1.5倍额定值时，动作时间小于3min；当电流为2.5倍额定值时，动作时间为(10±6)s；当电流为6倍额定值时，动作时间小于l～3s。

阅读理解。

     During summer vacations, I would work at a hospital for pets, so I'd seen a lot of dogs. Minnie was

by far the funniest-looking dog I'd ever seen. Thin curly hair barely covered her sausage-shaped body.

Her bugged-out (凸出)eyes always seemed surprised. And her tail looked like a rat's tail. She was brought

to the hospital because her owners didn't want her anymore. I thought Minnie had a sweet personality,

though."No one should judge her by her looks," I thought.

     She was quite fit and didn't need any treatment. So I advertised Minnie in the local paper:"Funny-looking

dog, well behaved, needs loving family."

     When a young man called, I warned him that Minnie was strange looking. The boy on the phone told

me that his grandfather's sixteen-year-old dog had just died. They wanted Minnie no matter what. I gave

Minnie a good bath and fluffed up(使松散) what was left of her poor hair. Then we waited for them to

arrive.

     At last,all old car pulled up in front of the vet's. Two kids raced to the door. They took Minnie into their

al ms and rushed her out to their grandfather, who was waiting in the car. I hurried behind them to see his

reaction(反应) to Minnie.

     Inside the car, the grandfather held Minnie in his arms and touched her soft hair gently. She moved her

mouth over his face. Her rat tail moved from side to side so quickly that it looked like it might fly off her

body. It was love at first lick (舔).

1. The dog's owner didn't like the dog probably because of _____.

A. the dog's curly hair

B. the dog's personality

C. the dog's poor health

D. the dog's strange look

2. From the passage, we know the dog was _____ to see her new owner .

A. pleased

B. surprised

C. disappointed

D. frightened

3. What would probably happen after grandfather saw the dog?

A. Grandfather would hate the dog's personality.

B. Grandfather would feel sad at the dog's rat tail.

C. The dog would be cared for by grandfather.

D. The dog would have to wait for another family.

某电阻、电容元件串联电路，经测量功率P为325W，电压U为220V，电流I为4．2A，求电阻R、电容C各是多少？

粗牙普通螺纹的代号不必标注螺距。