
电力线路过电流保护的动作时间一般在()。
A、0.2-0.5s
B、0.5-0.8s
C、0.8-1s
D、1-1.2s


A、0.2-0.5s
B、0.5-0.8s
C、0.8-1s
D、1-1.2s
Vocabulary Size Test: Version A
1. see: They
a. closed it tightly b. waited for it c. looked at it d. started it up
2. time: They have a lot of
a. money b. food c. hours d. friends
3. period: It was a difficult
a. question b. time c. thing to do d. book
4. figure: Is this the right
a. answer b. place c. time d. number
5. poor: We
a. have no money b. feel happy c. are very interested d. do not like to work hard
6. microphone: Please use the
a. machine for making food hot b. machine that makes sounds louder
c. machine that makes things look bigger d. small telephone that can be carried around
7. nil: His mark for that question was
a. very bad b. nothing c. very good d. in the middle
8. pub: They went to the
a. place where people drink and talk b. place that looks after money
c. large building with many shops d. building for swimming
9. circle: Make a
a. rough picture b. space with nothing in it c. round shape d. large hole
10. dig: Our dog often
a. solves problems with things b. creates a hole in the ground
c. wants to sleep d. enters the water
11. soldier: He is a
a. person in a business b. person who studies
c. person who uses metal d. person in the army
12. restore: It has been
a. said again b. given to a different person
c. made like new again d. given a lower price
13. pro: He's .
a.someone who is employed to find out important secrets b. a stupid person
c. someone who writes for a newspaper d. someone who is paid for playing sport
14. compound: They made a new
a. agreement b. thing made of two or more parts
c. group of people forming a business d. guess based on past experience
15. deficit: The company
a. spent a lot more money than it earned b. went down a lot in value
c. had a plan for its spending that used a lot of money d.had a lot of money stored in the bank
16. strap: He broke the
a. promise b. top cover c. shallow dish for food d. strip of strong material
17. weep: He
a. finished his course b. cried c. died d. worried
18. haunt: The house is
a. full of decorations b. rented c. empty d. full of ghosts
19. cube: I need one more
a. sharp thing used for joining things b. solid square block
c. tall cup with no saucer d. piece of stiff paper folded in half
20. butler: They have a
a. man servant b. machine for cutting up trees
c. private teacher d. cool dark room under the house
21. nun: We saw a
a. long thin creature that lives in the earth b. terrible accident
c. woman following a strict religious life d. unexplained bright light in the sky
22. olive: We bought
a. oily fruit b. scented flowers c. men's swimming clothes d. tools for digging
23. shudder: The boy
a. spoke with a low voice b. almost fell c. shook d. called out loudly
24. threshold: They raised the
a. flag b. point or line where something changes
c. roof inside a building d. cost of borrowing money
25. demography: This book is about
a. he study of patterns of land use b. the study of the use of pictures to show facts about numbers
c. the study of the movement of water d. the study of population