简述类风湿关节炎(美国风湿病学会1987年)分类标准。

临床资料：女，39岁。无意中发现腹部包块半年，肿块进行性增大并腰酸、双下肢酸痛，加重气短左下肢水肿1周。临床物理检查：左上腹膨隆，触及一约15.0cm×20.0cm肿物，边界清楚，活动度差，有明显膨胀性搏动感及震颤，无触压痛及反跳痛；听诊有明显血管杂音，与脉搏节律一致。超声综合描述：腹主动脉失常态，起始段内径1.7cm，腹腔动脉干水平内径1.6cm，自肠系膜上动脉水平至髂总动脉分叉处明显增宽，最大内径11.3cm，增宽段显示长度17.0cm；PW：呈动脉充填型湍流频谱，V～116.0cm／s；瘤样扩张近心端呈S形屈曲，CDFI：呈明亮高速五彩镶嵌状血流束，Vmax261.9cm／s。见彩图60。超声提示（）

A.腹腔囊性占位

B.假性腹主动脉瘤

C.巨大真性腹主动脉瘤

D.腹主动脉夹层动脉瘤

有六个命题：

①如果函数y=f（x）满足f（a+x）=f（a-x），则y=f（x）图象关于x=a对称；②如果函数f（x）满足f（a+x）=f（a-x），则y=f（x）的图象关于x=0对称；③如果函数y=f（x）满足f（2a-x）=f（x），则y=f（x）的图象关于x=a对称；④函数y=f（x）与

f（2a-x）的图象关于x=a对称；⑤函数y=f（a-x）与y=f（a+x）的图象关于x=a对称；⑥函数y=f（a-x）与y=f（a+x）的图象关于x=0对称．则正确的命题是______（请将你认为正确的命题前的序号全部填入题后横线上，少填、填错均不得分）．

Massachusetts (美国一州名) became the first state in the nation to ban the dumping (倾倒;抛弃) of electronic equipment such as computer monitors and television sets. It means people there can no longer put computer monitors, TV sets and other devices containing glass picture tubes out on the street for pickup by garbage cleaners.

Official said much of this equipment is loaded with poisonous heavy metals such as lead, cadmium and mercury. These poisonous heavy metals could go into groundwater or be released (释放) into the air.

The Boston Globe reports the state has set up a system to recycle techno-garbage at state expense through community recycling centers.

Robin Ingenthron of the Massachusetts Department of Environmental Protection said the state has been trying to get its electronics-recycling program in place ‘before the future wave of electronics hits’. The National Safety Council estimates some 300 million computers will enter the nation’s waste system in the next few years.

In addition, millions of people will be getting rid of their old television sets. New high-quality digital televisions and new rules will make old TV sets no longer in use over the next several years.

小题1:The word ‘techno-garbage’ in the 3rd paragraph probably means ________.

A．all kinds of dirty things

B．deserted TV sets

C．heavy metals

D．used electronic equipment小题2:The passage tells us chiefly about __________.

A．forbidding of a certain type of garbage dumping

B．new problems of environmental protection

C．household problems raised by computers and TV sets

D．the handling of garbage小题3:     Which is NOT a reason that the state enforces (强制执行) a ban on electronic equipment dumping?

A．This kind of garbage is poisonous.

B．Recycling systems are not working well.

C．The poisonous heavy metals can go to the underground water and the air.

D．There will be much more electronic garbage soon.小题4: According to the last paragraph many people will be dumping their TV sets because ________.

A．they are broken

B．they are poisonous

C．new TV standards have come out

D．people will be tired of them

盘铣刀主要用于加工( )

A．平面
B．圆柱面
C．沟槽
D．成形面

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