Cho mạch điện như hình vẽ

R₁=3Ω R₂=6Ω U_AB= 24V

a) tính R_tđ của toàn mạch

b) tính cường độ dòng điện qua mỗi điện trở

Cho mạch điện như hình vẽ :<

R_1=6Ω R₂=12Ω UAB=24V

a) tính R_tđ của đoạn mạch AB

b) Tính hiệu điện thế giữa 2 đầu mỗi điện trở

Đặt câu trạng ngữ chỉ nơi chốn

Trạng ngữ chỉ mục đích

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Trạng ngữ chỉ cách thức

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 33 to 42. Fill in the appropriate word in question 33

                TRAFFIC LIGHTS

The first traffic signal was invented by a railway signaling engineer. It was installed (33) ___ the Houses of Parliament in 1868. It (34)_____ like any railway signal of the time, and was operated by gas.  (35) ____, it exploded and killed a policeman, and the accident discouraged further development until cars became common.

(36) ____ traffic lights are an American invention. Red – green systems were installed in Cleveland in 1914. Three - color signals, operated (37) _____ hanz d from a tower in the (38) _____ of the street, were installed in New York in 1918. The first lights of this type to (39) ____ in Britain were in London, on the junction between St. James’s Street and Piccadilly, in 1925. Automatic signals were installed (40) ____ year later.

In the past, traffic lights were special. In New York, some lights had a statue on top. In Los Angeles the lights did not just change silently, but would ring bells to (41) _____ the sleeping motorists of the 1930s. These are gone and have been (42) ____ by standard models which are universally adopted.

A. outside

B. out

C. out of 

D. outdoors