直流电机定子主要由（）、（）、（）和（）等组成。

完形填空。
My family moved into our home nine years ago and we spent a lot of time and energy in the yard to get it looking like it does today. We live on a corner and the yard is   1   by a rock wall. We call this area our "rock garden".      Last summer, I found a tiny little   2   in the yard that I could not immediately identify. I knew I didn't plant it. We   3   to let it continue growing until we could   4   what it was.      Weeks passed and as I made my way back to the   5   plant, it appeared to be a sunflower. I decided to treat it with care and  6   the weeds around it. As I pulled rocks from the area to get to the weeds, I noticed something   7  . The sunflowers had not  8   where I saw the stalk (茎) began. It   9   had begun under a big rock and grown under and around it to reach the   10  .      That's when I   11   that if a tiny little sunflower didn't let a big rock stand in its   12   of developing, we too have the capability of doing the same thing.   13   our environment begins to see that we believe in ourselves like that little sunflower, we can   14   the same nutrient as well.   15  , we need to believe in ourselves knowing we have the capabilities in   16   our desires. Like the sunflower, it knew it had the capability to overcome its obstacle because it   17   in the universal truth and had   18   that it would succeed.      Stand tall like the sunflower and be   19   of who and what you are and the environment will begin to support you. You will find a way to go under or   20   your big obstacle in order to reach your desires.
(     )1. A. surrounded (     )2. A. seed        (     )3. A. wished      (     )4. A. watch out (     )5. A. weak        (     )6. A. removed    (     )7. A. wonderful (     )8. A. passed     (     )9. A. aimlessly (     )10. A. air        (     )11. A. realized (     )12. A. place      (     )13. A. Although (     )14. A. seek      (     )15. A. First      (     )16. A. setting    (     )17. A. lay        (     )18. A. faith      (     )19. A. proud      (     )20. A. beneath	B. covered   B. animal     B. decided   B. work out   B. mysterious B. refused   B. secret     B. started   B. naturally B. top       B. doubted   B. way       B. Since     B. dig       B. Generally B. controlling B. trusted   B. energy     B. fond       B. over	C. blocked C. plant   C. preferred C. give out   C. lonely   C. reformed C. valuable C. stopped C. especially C. sun     C. expected C. course   C. Unless   C. gain     C. Finally C. achieving C. grew     C. hope     C. careful C. above	D. cut         D. rock         D. refused     D. figure out   D. remarkable   D. regained     D. unusual     D. broken       D. actually     D. wall         D. noticed     D. process     D. Once         D. attract     D. Eventually   D. directing   D. rooted       D. courage     D. aware       D. around

MS临床特征是（）的多发性和（）上的多发性。

有机磷农药中毒有哪些症状体征

(四)

某车床有A、B、C三个加工组，三个加工组的产品都用直方图来表示产品分布情况。

若数据为16，25，20，19，25，27，则极差为( )。

A．11

B．0

C．5

D．2

下壁心内膜下缺血心电图特点是

A．Ⅰ、avL、ST段水平下移≥0.2mV
B．Ⅱ、Ⅲ、aVF出现高大直立的T波
C．V1～V3ST段水平下移≥0.2mV
D．Ⅱ、Ⅲ、aVF出现T波倒置
E．Ⅱ、Ⅲ、aVF各导联ST、T波无变化