Điều nào sau đây không đúng khi nói về hệ số tự cảm của ống dây?

A. phụ thuộc vào số vòng dây của ống

B. phụ thuộc tiết diện ống

C. không phụ thuộc vào môi trường xung quanh

D. có đơn vị là H (henry)

HỒ NGỌC HÀ

Xét (O) có góc PMN = góc APN ( góc nội tiếp và góc tạo bởi tiếp tuyến và dây cùng chắn cung PN)

Lại có PM//AQ(gt) =>góc PMN= góc MAQ

=>góc APK= góc NAK

Xét 2 tam gia KAP và KNA có:

\(\left\{{}\begin{matrix}gocAKPchung\\gocAPK=NAK\left(cmt\right)\end{matrix}\right.\)

=>2 tam giác KAP và KNA đồng dạng (gg)

=>đpcm

Mark the letter A,B,C or D on your answer sheet to indicate the correct answer to each of the following questions

The university administrations are introducing new measures to………………….that the enrolment process runs smoothly 

A. maintain 

B. improve 

C. facilitate 

D. ensure

Traditionally, Americans and Asians have very different ideas ________ love and marriage.

A. to

B. at

C. about

D. in

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42.

Children all around the world love to read comic books. Maybe they like to read the kind of comic books that come out once a month, like Spiderman or Batman, or maybe they like manga­style comic books. That means that publishers who make comic books need to keep in touch with the things young people like to do. One thing that many young people today are interested in is technology, so of course kids want to read digital comic books on electronic devices.

Let's take Japanese rnanga as an example. There are lots of people around the world who enjoy reading manga. However, in the past, it was difficult to find translated versions of manga in comic bookstores. But that did not stop manga fans. Some fans who could translate Japanese into their own language started translating manga themselves. Then they scanned the pages of manga books and uploaded the scanned pages to the Internet with their translation. This practice has become so popular. People in the comic book industry made up a name for it. By combining the

words scan and translation, they call it "scanlation", and it is a big problem today. The people who do scanlation usually share their manga for free, so readers do not buy manga books. Writers, artists, and publishers all end up losing money because of scanlation. Another problem is piracy in the comic book industry. illegal copies of old and brand new comics alike have been hurting comic book sales.

Despite the progress made in converting comics to digital formats, hardcopy comic books are still by far the most popular format among fans. In the meantime, comic book publishers and stores will just have to keep an eye on their buyers' habits. As the popularity of digital books for e-readers and tablets grows, the popularity of digital comic books will grow as well.

Question 36. What is the passage mainly about?

A. The need for digital comic books

B. Children's most favourite type of books

C. Problems in the book industry

D. The manga industry in Japan