How to write quotation marks

Question 1: The correct way to write vertical double quotation marks The usage of punctuation marks (GB/T 15834- 1995) stipulates the following for vertical single quotation marks and double quotation marks:

6. The difference between punctuation marks in straight books and horizontal books.

6.3 The quotation marks are changed to double quotation marks and single quotation marks.

Question 2: There are quotation marks in double quotation marks. How to write the answer?

Use single quotation marks''

Question 3: How to write the front quotation mark and how to write the front quotation mark \ "back quotation mark \" in the back quotation mark.

Question 4: How to write quotation marks?

Question 5: How to write the opening quotation marks? Left quotation mark

Quotation mark = quotation mark ('')

Double quotation mark = double quotation mark ()

Question 6: How to write out. println(return) in double quotation marks?

Double quotation marks are preceded by a slash \