Trong không gian với hệ tọa độ Oxyz, cho A 2 ; 1 ; − 1 , B 3 ; 0 ; 1 . Tìm điểm C ∈ O z  sao cho tam giác ABC vuông tại B

A. C 0 ; 3 2 ; 0 .

B. C 0 ; 0 ; 5 2 .

C. C 0 ; 0 ; 3 .

D. C 0 ; 0 ; 5 .

d

Read the following passage, and answer the questions that follow

An earthquake measuring 7.8 on the Richter scale hit Nepal on April 25th, 2015. It was the most powerful earthquake to strike Nepal since 1934. The earthquake occurred in central Nepal. It also affected India, Bangladesh and Tibet, China. The earthquake killed more than 8,800 people and injured over 23, 000 people. Hundreds of thousands of people were made homeless with entire villages flattened. Kathmandu Burbar Square, a UNESCO World Heritage Site, was destroyed. The earthquake also caused an avalanche on Mount Everest which killed at least 19 people. About 90% of soldiers from Nepalese Army were sent to stricken areas. Many countries and international organizations sent medical experts, emergency workers, rescue staff, and money as well as providing medical supplies, food and equipment to help Nepal.

What hit Nepal on April 25th, 2015?

A. a tsunami

B. a tornado

C. an earthquake

D. a forest fire

Chọn câu sai

A. 7 ∈ N

B. ∅ ⊂ N

C. ∅ ∈ N

D. {1;2;3;4;5} ⊂ N

Khi thuê nhà của ông A, ông B đã tự sửa chữa, cải tạo nhà của ông A mà không hỏi ý kiến ông A vì cho rằng mình bỏ tiền ra thuê nên mình có quyền sửa chữa. Hành vi của ông A là hành vi vi phạm?

A. dân sự. 

B. hình sự. 

C. hành chính. 

D. kỷ luật.