What is the ozone layer made of?
Đáp án A
Tầng ozone được tạo bởi?
A. Khí oxy B. Màng chắn C. Tia cực tím D. Floruacacbon
The word “constrained” in paragraph 4 is closest in meaning to______.
According to the passage, who was the first person to use artificial refrigeration for a practical purpose?
According to the passage, the first refrigerated railcar used what material as a cooling agent?
The word "rough"in the passage is closest in meaning to ___________.
According to the passage, all of the following are true EXCEPT___________.
How did Juliette Davidson benefit from the experience of her first job?
What is the main reason that people developed methods of refrigeration?
What is the main point the writer is trying to make in the last paragraph?
What can be inferred from paragraph 1 about cold storage before the invention of artificial refrigeration?
Artificial refrigeration involves all of the following processes EXCEPT______.
The passage suggests that industrialization in the West led to all of the following EXCEPT ______.