Cho hai chất điểm M, N chuyển động tròn đều, cùng chiều trên một đường tròn tâm O, bán kính R = 10 cm với cùng tốc độ dài là 1 m/s. Biết góc MON bằng 30 0 . Gọi K là trung điểm MN, hình chiếu của K xuống một đường kính đường tròn có tốc độ trung hình trong một chu kì xấp xỉ bằng

A. 30,8 cm/s.

B. 86,6 cm/s.

C. 61,5 cm/s.

D. 100 cm/s.

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions

The General Certificate of Secondary Education (GCSE) is the name of a set of English qualifications, generally taking by secondary school students at the age of 15-16 in England

A. the name

B. a set of

C. taking

D. at the age

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase for each of the blanks

 One of the hottest topics on the international development agenda is how to harness the power of International Monetary Fund for the benefit of developing countries. What is sometimes called “the death of distance”, brought about by the (55)                      , allow professional services such as (56)______education and training to be provided easily and quickly to (57)                   areas. Some of the gains can be seen in countries as diverse as India and Morocco, where innovations range from (58) _________ government announcements to local craftsmen selling their wares to a (59)________market. But already a huge and expanding (60) _________ divide is opening up between developed and developing nations. The major tasks facing world leaders at present is to (61) ________ everybody on the planet with clean water, basic education and the drugs needed to fight preventable diseases. Installing a (62)______in every classroom and linking us to (63)                     must be a lesser (64)_______, for the time being at least.

Điền vào ô 63

A. the real world  

B. outer space                

C. virtual reality   

D. cyberspace

Cần thay đổi trị số của linh kiện nào để thay đổi hệ số khuếch đại của mạch khuếch đại thuật toán?

Cho các phân tử (1) MgO; (2) Al₂O₃; (3) SiO₂; (4) P₂O₅. Độ phân cực của chúng được sắp xếp theo chiều tăng dần từ trái qua phải là:

A. (3), (2), (4), (1).

B. (1), (2), (3), (4).

C. (4), (3), (2), (1).

D. (2), (3), (1), (4).

Các bạn nối giúp mik từ cột số sang cột chữ

0.You can’t come in here.
1.You can’t leave your bicycle here.
2. Adults shouldn’t let children play with this.
3. You can buy children’s clothes here.
4. Do not come in if you are not wearing the rightclothes.
5. Use this door to go outside

A.School Uniform Department - This floor
B. DANGER!No hard hat? No boots?NO ENTRANCE
C. NO BICYCLES AGAINSTTHIS WINDOW
D. BICYCLES ONLY
E. KEEP OUT!
F. Exit to Shoemaker Road
G. DANGER!KEEP AWAY FROM CHILDREN
H. BICYCLES TO RENT: Adults £3.50 per hour Children
£2.00 per hour

- “What an attractive hair style you have got, Mary!” - “_______”

A. Thank you very much. I am afraid

B. I don't like your sayings

C. You are telling a lie

D. Thank you for your compliment