Chủ đề:
Bài 16: Phương trình hóa họcCâu hỏi:
Viết a gam bột sắt phản ứng vừa đủ với b gam oxi tạo ra 11,6 gamOxit sắt từ(Fe3O4 )
Tìm giá trị của a và b .Viết phương trình hóa học
4. Electronically stored information is easilly..........
A. resumed B. updated C. rebuilt D. predated
5. Robot arms ............. the parts of the car together
A. weld B. melt C. sew D. saw
6. this plane can fly at over twice the speed of ..............
A. sound B. flight C. noise D. bang
7. they heard the plane go throught the sound ..............
A. limit B. barrier C. frontier D. junction
8. Tens of thousands of circuit can be ........... onto one microchip
A. crushed B. cranked C. crammed D. crunched
9. We can pick ........... radio signals from all over the worls
A. up B. on C. at D. off
10. I couldn't receive the program very clearly because of ........ caused by weather conditions
A. blocks B. blockage C. leakage D. interference
Choose the best answer
1. To receive satellite TV, we need a special ...........
A. area B. scree C. antenna D. reception
2. Radar ............ pilots to land in difficult weather conditions
A. lets B. enable C. makes D. succeeds
3. From this terminal you can call ........ our main computer at the head office
A. on B. for C. at D. up
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