在双绞线组网的方式中，( )设备是以太网的中心连接设备。A．集线器 B．中继器 C

如图是四川南骏汽车集团有限公司生产的“南骏牌”汽车，它为我市经济建设做出了巨大的贡献．表中是南骏牌某新型运输车的部分参数．

但一些运输单位为了降低运营成本，肆意超载造成路面损坏．设砂石的平均密度为ρ=2.5×10³kg/m³，g取10N/kg，求：（1）若该车车厢容积为12m³，装满砂石时汽车对水平路面的压强多大？超载百分之几？（2）已知砂石厂到建筑工地的距离为18km，若该车按照核定最大载重以额定功率匀速行驶，行驶过程中受到的平均阻力是车重的k=0.02倍，则从砂石厂到达建筑工地需要多长时间？

Being beautiful means a lot to teenage girls. Once it did to me too. I was the vainest person in the world, but that all changed one December night.

It was a Thursday, and I was getting ready for the wrestling tournament the following day. I was so excited; it was going to be my first tournament as a cheerleader. I walked past the mirror and stopped to check my appearance. I noticed my eyebrows were a little bushy, and that’s when my vanity kicked in. The brows could be easily fixed with the waxing kit I had purchased. I put the jar of wax in the microwave. But instead of heating the wax for 30 seconds, I pressed too many zeros and heated it for three minutes. As I reached for the jar, I dropped it, spilling it all over myself.

My mother came running when she heard my screams. The hot wax was rolling down my face and arm. My mom took a wet washcloth and tried to wash the wax off my face. This proved to be a bad idea, because the wax was honey based, and it pulled my skin off with the wax.

The 15-mile drive to the emergency room seemed to take hours. When we finally arrived, the nurse didn’t waste any time. They took me straight to a doctor and gave me extra-strength painkillers, so my mind was in confusion. The doctor explained how severe my burns really were: my arm was a combination of first-, second- and third-degree burns, and needed to stay bandaged. My face was first- and second-degree burns. If the wax had gotten any closer to my right eye, I would have lost my sight. I was covered in multi-colored “goop(药膏)”, wrapped, and sent home to recover.

I got up the next morning and the first thing I wanted to do was wash off the remaining wax. I unwrapped the bandages and “degooped”, letting warm water gently remove the rest of the wax. The next step was to do a self-evaluation of the damage. I couldn’t believe how horrible I looked. A horror-movie monster stared back at me from the mirror. All I could think was, my life is over. For someone as vain as me, this was very true. I thought I was going to be horribly disfigured(毁容的)for the rest of my life! All I could do was cry.

My mom made it worse by forcing me to go out in public. She dragged me to the grocery store and wherever else she felt like taking me. Everywhere we went, people had a million questions, none of which I wanted to answer. Then my mom declared she was going to put me through even more torture—I had to go to school on Monday. School only led to more questions from more people.

Now, two years later, my wounds have healed, leaving a few scars. I still feel self-conscious if I don’t wear make-up, and I’ve discovered that three-quarter length sleeves are wonderful for covering the scars on my arm.

After spending several months adjusting to this injury, I realized how vain I was. I had made beauty important, but it never was or will ever be that important. It took this event to teach me that no matter how much you change on the outside, you’re still the same person on the inside. 

小题1:After the accident, the writer has come to realize that ________.

A．teenage girls care too much about their appearance

B．loving beauty will necessarily make one disfigured

C．we can never judge a person merely by one’s looks

D．sometimes being beautiful can cost you something小题2:Which of the four statements is a fact?

A．The severe damage to her sight and face weren’t recovered.

B．The mother wished the writer to face her misfortune bravely.

C．From the lesson we conclude that “once bitten, twice frightened”.

D．The severe burns were caused by her mother’s lack of first-aid.小题3:The underlined sentence in the last paragraph is closest to ________.

A．beauty is not everything

B．a student shall not make up

C．beauty is not important

D．loving beauty will spoil you小题4:The author develops her composition by ________.

A．offering accurate facts

B．giving contrast and comparison

C．using logical arguments

D．representing own experiences小题5:Which of the following can be the best title?

A．The Price of Vanity

B．An Unexpected Ending

C．A Disfigured Girl

D．Beauty Ruins Everything

()以上地方各级人民政府应当组织有关部门指定本行政区域内特大安全生产事故应急救援预案，建立应急救援体系。

A．地区级

B．市级

C．县级

D．省级

设三元二次型f(x₁，x₂，x₃)=X^TAX的正惯性指数p=1，且二次型A满足A²+2A-3E=0，则在正交变换下该二次型的标准形是______．

A．

B．

C．

D．

根据我国《会计法》规定，单位负责人既要对本单位的会计工作担负责任，同时还要对本单位保存和提供的会计资料的真实性、完整性担负责任。( )