如图是一种焊接方法的原理示意图．将圆形待焊接金属工件放在线圈中，然后在线圈中通以

某住宅设计方案的功能评价系数和功能的现实成本(目前成本)如下表所示：

功能	功能评价系数	目前成本/万元
F1	0.5	220 0.55
F2	0.3	100 0.25
F3	0.2	80 0.2
合计	1	400

若拟控制的目标成为360万元，则应首先降低( )的成本。

A．F₁

B．F₂

C．F₃

D．F₂和F₃

-John and I will celebrate our fortieth wedding anniversary next month.

-Oh,      ! [ ]

A.cheer up

B.well done

C.go ahead

D.congratulations

完形填空。

When I was eleven, I had a paper route (送报纸). One of my   1  , an old lady, taught me a lesson I've never forgotten.      One winter afternoon, my friend and I were throwing stones    2   the roof of the old lady's house. We wanted to   3   the stones roll down to the roofs edge and shoot out into the yard. I found a smooth rock. As I threw it, the stone slipped from my hand and crashed (撞击) through a small window. We turned around and ran   4   quickly.      At first, I was too scared about getting   5   to worry about the old lady's window. But after a few days, I started to feel guilty. She still   6   me with a smile whenever I gave her the paper, but I no longer felt   7  .      I decided to   8   my paper delivery money, and in three weeks I had seven dollars. I put the money in an envelope with a note   9   that I was sorry for breaking her window and hoped she could use my money to  10  it.      I snuck up (悄悄走到) to the old lady's house and slid (偷偷塞进) the envelope under her door. It made me feel much better.      The next day, I handed the old lady her paper and  11  her warm smile. She game me a bag of cookies. I thanked her and continued my route.      After eating several cookies, I felt an envelope inside the bag. When I opened it, I was greatly  12 . Inside were the seven dollars and a note that said, "I'm proud of you."

( )1. A. guests        ( )2. A. onto           ( )3. A. watch          ( )4. A. out            ( )5. A. lost         ( )6. A. followed       ( )7. A. interested    ( )8. A. pay          ( )9. A. explaining     ( )10. A. buy           ( )11. A. remember       ( )12. A. moved        B. teachers    B. into        B. see         B. back        B. caught      B. left        B. frightened  B. save        B. complaining       B. find        B. showed      B. surprised   C. customers     C. across        C. hear          C. off           C. hurt          C. helped        C. comfortable   C. make          C. introducing       C. clean         C. returned      C. improved    D. friends       D. through       D. notice           D. away          D. started          D. greeted                      D. terrible        D. change         D. instructing     D. repair          D. refused        D. influenced

男孩，1岁。因发热、腹泻3d于1994年10月住院，起病后每天解蛋花汤样大便十余次，量中等。体温38℃，偶有轻咳，2d来尿少，近10h无尿。体检：前囟凹陷，皮肤弹性差，肢端凉。大便镜检偶见白细胞。血白细胞数8.6××10⁹/L，血钠135mmol/L。

患儿在治疗中突然发生惊厥，此时应做哪项检查

A．血气

B．血钠

C．血钾

D．血钙

E．血CO₂CP

煎厥