Which of the following can provide the better durability with the technique called electrospinning?
D. A polymer layer
Giải bởi Vietjack
Đáp án C
Cái nào dưới đây cho độ bền cao nhất với kĩ thuật kéo sợi dụng lực tĩnh điệnA. điện áp cao
B. Vật liệu mới
C. 1 chuỗi sợi nano
D. 1 lớp polyme
Thông tin này nằm ở hai câu đầu tiên của đoạn cuối cùng: "Recently, another new technique called electrospinning was developed that could make future products even tougher to break. The process involves applying high voltage to a polymer to create a strand of nanofiber." (Gần đây, một công nghệ mới khác được gọi là quay điện hóa đã được phát triển có thể giúp cho các sản phẩm trong tương lai thậm chí còn khó vỡ hơn. Quá trình này liên quan đến việc ứng dụng điện áp cao vào một chất trùng hợp để tạo ra một sợi nano)
The food being cooked in the kitchen was giving ________ a wonderful smell.
Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.
Harry displays enthusiasm whenever he is posed with a problem.
The word “penetrate” in paragraph 3 is closest in meaning to ________.
Read the following passage and mark the letter A, B, C, or D on your answer sheet to choose the word or phrase that best fits each of the numbered blanks from 25 to 29
An earthquake is the result of a sudden release of energy in the Earth's crust that creates seismic waves. At the Earth's surface, earthquakes are recognized (25) _______ vibration, shaking and sometimes displacement of the ground. The vibrations may vary in (26) _______. They are caused mostly by slippage within geological faults, but also by other events such as volcanic activity, landslides, mine blasts, and nuclear tests. The underground point of (27) _____ of the earthquake is called the focus. The point directly above the focus on the surface is called the epicenter. Earthquakes by themselves rarely kill people or wildlife. It is usually the secondary events (28) _______ they trigger, such as building collapse, fires, tsunamis (seismic sea waves) and volcanoes, that are actually the human disaster. Many of these could possibly be avoided by better construction, safety systems, early warning and (29) _______ planning.
Peter went out for two hours. When he returned I asked him where _______.
The recycling of aluminum converses ninety percent of the energy needed to make new metal.
Many of these could possibly be avoided by better construction, safety systems, early warning and (29) _______ planning.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The press puts ________ on the police forces who were unable to cope with the crowd of savage hooligans.
Her parents insisted that she ________ until she ________ her degree.
What do the collections of folk tales made in the late 19th and early 20th provide the historians?
